diff --git a/cache.go b/cache.go
index db88d2f..a6d8f01 100644
--- a/cache.go
+++ b/cache.go
@@ -10,13 +10,13 @@ import (
 	"time"
 )
 
-type Item struct {
-	Object     interface{}
+type Item[V any] struct {
+	Object     V
 	Expiration int64
 }
 
 // Returns true if the item has expired.
-func (item Item) Expired() bool {
+func (item Item[V]) Expired() bool {
 	if item.Expiration == 0 {
 		return false
 	}
@@ -32,23 +32,23 @@ const (
 	DefaultExpiration time.Duration = 0
 )
 
-type Cache struct {
-	*cache
+type Cache[K comparable, V any] struct {
+	*cache[K, V]
 	// If this is confusing, see the comment at the bottom of New()
 }
 
-type cache struct {
+type cache[K comparable, V any] struct {
 	defaultExpiration time.Duration
-	items             map[string]Item
+	items             map[K]Item[V]
 	mu                sync.RWMutex
-	onEvicted         func(string, interface{})
-	janitor           *janitor
+	onEvicted         func(K, V)
+	janitor           *janitor[K, V]
 }
 
 // Add an item to the cache, replacing any existing item. If the duration is 0
 // (DefaultExpiration), the cache's default expiration time is used. If it is -1
 // (NoExpiration), the item never expires.
-func (c *cache) Set(k string, x interface{}, d time.Duration) {
+func (c *cache[K, V]) Set(k K, x V, d time.Duration) {
 	// "Inlining" of set
 	var e int64
 	if d == DefaultExpiration {
@@ -58,7 +58,7 @@ func (c *cache) Set(k string, x interface{}, d time.Duration) {
 		e = time.Now().Add(d).UnixNano()
 	}
 	c.mu.Lock()
-	c.items[k] = Item{
+	c.items[k] = Item[V]{
 		Object:     x,
 		Expiration: e,
 	}
@@ -67,7 +67,7 @@ func (c *cache) Set(k string, x interface{}, d time.Duration) {
 	c.mu.Unlock()
 }
 
-func (c *cache) set(k string, x interface{}, d time.Duration) {
+func (c *cache[K, V]) set(k K, x V, d time.Duration) {
 	var e int64
 	if d == DefaultExpiration {
 		d = c.defaultExpiration
@@ -75,7 +75,7 @@ func (c *cache) set(k string, x interface{}, d time.Duration) {
 	if d > 0 {
 		e = time.Now().Add(d).UnixNano()
 	}
-	c.items[k] = Item{
+	c.items[k] = Item[V]{
 		Object:     x,
 		Expiration: e,
 	}
@@ -83,18 +83,18 @@ func (c *cache) set(k string, x interface{}, d time.Duration) {
 
 // Add an item to the cache, replacing any existing item, using the default
 // expiration.
-func (c *cache) SetDefault(k string, x interface{}) {
+func (c *cache[K, V]) SetDefault(k K, x V) {
 	c.Set(k, x, DefaultExpiration)
 }
 
 // Add an item to the cache only if an item doesn't already exist for the given
 // key, or if the existing item has expired. Returns an error otherwise.
-func (c *cache) Add(k string, x interface{}, d time.Duration) error {
+func (c *cache[K, V]) Add(k K, x V, d time.Duration) error {
 	c.mu.Lock()
 	_, found := c.get(k)
 	if found {
 		c.mu.Unlock()
-		return fmt.Errorf("Item %s already exists", k)
+		return fmt.Errorf("Item %v already exists", k)
 	}
 	c.set(k, x, d)
 	c.mu.Unlock()
@@ -103,12 +103,12 @@ func (c *cache) Add(k string, x interface{}, d time.Duration) error {
 
 // Set a new value for the cache key only if it already exists, and the existing
 // item hasn't expired. Returns an error otherwise.
-func (c *cache) Replace(k string, x interface{}, d time.Duration) error {
+func (c *cache[K, V]) Replace(k K, x V, d time.Duration) error {
 	c.mu.Lock()
 	_, found := c.get(k)
 	if !found {
 		c.mu.Unlock()
-		return fmt.Errorf("Item %s doesn't exist", k)
+		return fmt.Errorf("Item %v doesn't exist", k)
 	}
 	c.set(k, x, d)
 	c.mu.Unlock()
@@ -117,7 +117,7 @@ func (c *cache) Replace(k string, x interface{}, d time.Duration) error {
 
 // Get an item from the cache. Returns the item or nil, and a bool indicating
 // whether the key was found.
-func (c *cache) Get(k string) (interface{}, bool) {
+func (c *cache[K, V]) Get(k K) (*V, bool) {
 	c.mu.RLock()
 	// "Inlining" of get and Expired
 	item, found := c.items[k]
@@ -132,14 +132,14 @@ func (c *cache) Get(k string) (interface{}, bool) {
 		}
 	}
 	c.mu.RUnlock()
-	return item.Object, true
+	return &item.Object, true
 }
 
 // GetWithExpiration returns an item and its expiration time from the cache.
 // It returns the item or nil, the expiration time if one is set (if the item
 // never expires a zero value for time.Time is returned), and a bool indicating
 // whether the key was found.
-func (c *cache) GetWithExpiration(k string) (interface{}, time.Time, bool) {
+func (c *cache[K, V]) GetWithExpiration(k K) (*V, time.Time, bool) {
 	c.mu.RLock()
 	// "Inlining" of get and Expired
 	item, found := c.items[k]
@@ -156,16 +156,16 @@ func (c *cache) GetWithExpiration(k string) (interface{}, time.Time, bool) {
 
 		// Return the item and the expiration time
 		c.mu.RUnlock()
-		return item.Object, time.Unix(0, item.Expiration), true
+		return &item.Object, time.Unix(0, item.Expiration), true
 	}
 
 	// If expiration <= 0 (i.e. no expiration time set) then return the item
 	// and a zeroed time.Time
 	c.mu.RUnlock()
-	return item.Object, time.Time{}, true
+	return &item.Object, time.Time{}, true
 }
 
-func (c *cache) get(k string) (interface{}, bool) {
+func (c *cache[K, V]) get(k K) (*V, bool) {
 	item, found := c.items[k]
 	if !found {
 		return nil, false
@@ -176,760 +176,38 @@ func (c *cache) get(k string) (interface{}, bool) {
 			return nil, false
 		}
 	}
-	return item.Object, true
-}
-
-// Increment an item of type int, int8, int16, int32, int64, uintptr, uint,
-// uint8, uint32, or uint64, float32 or float64 by n. Returns an error if the
-// item's value is not an integer, if it was not found, or if it is not
-// possible to increment it by n. To retrieve the incremented value, use one
-// of the specialized methods, e.g. IncrementInt64.
-func (c *cache) Increment(k string, n int64) error {
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return fmt.Errorf("Item %s not found", k)
-	}
-	switch v.Object.(type) {
-	case int:
-		v.Object = v.Object.(int) + int(n)
-	case int8:
-		v.Object = v.Object.(int8) + int8(n)
-	case int16:
-		v.Object = v.Object.(int16) + int16(n)
-	case int32:
-		v.Object = v.Object.(int32) + int32(n)
-	case int64:
-		v.Object = v.Object.(int64) + n
-	case uint:
-		v.Object = v.Object.(uint) + uint(n)
-	case uintptr:
-		v.Object = v.Object.(uintptr) + uintptr(n)
-	case uint8:
-		v.Object = v.Object.(uint8) + uint8(n)
-	case uint16:
-		v.Object = v.Object.(uint16) + uint16(n)
-	case uint32:
-		v.Object = v.Object.(uint32) + uint32(n)
-	case uint64:
-		v.Object = v.Object.(uint64) + uint64(n)
-	case float32:
-		v.Object = v.Object.(float32) + float32(n)
-	case float64:
-		v.Object = v.Object.(float64) + float64(n)
-	default:
-		c.mu.Unlock()
-		return fmt.Errorf("The value for %s is not an integer", k)
-	}
-	c.items[k] = v
-	c.mu.Unlock()
-	return nil
-}
-
-// Increment an item of type float32 or float64 by n. Returns an error if the
-// item's value is not floating point, if it was not found, or if it is not
-// possible to increment it by n. Pass a negative number to decrement the
-// value. To retrieve the incremented value, use one of the specialized methods,
-// e.g. IncrementFloat64.
-func (c *cache) IncrementFloat(k string, n float64) error {
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return fmt.Errorf("Item %s not found", k)
-	}
-	switch v.Object.(type) {
-	case float32:
-		v.Object = v.Object.(float32) + float32(n)
-	case float64:
-		v.Object = v.Object.(float64) + n
-	default:
-		c.mu.Unlock()
-		return fmt.Errorf("The value for %s does not have type float32 or float64", k)
-	}
-	c.items[k] = v
-	c.mu.Unlock()
-	return nil
-}
-
-// Increment an item of type int by n. Returns an error if the item's value is
-// not an int, or if it was not found. If there is no error, the incremented
-// value is returned.
-func (c *cache) IncrementInt(k string, n int) (int, error) {
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("Item %s not found", k)
-	}
-	rv, ok := v.Object.(int)
-	if !ok {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("The value for %s is not an int", k)
-	}
-	nv := rv + n
-	v.Object = nv
-	c.items[k] = v
-	c.mu.Unlock()
-	return nv, nil
-}
-
-// Increment an item of type int8 by n. Returns an error if the item's value is
-// not an int8, or if it was not found. If there is no error, the incremented
-// value is returned.
-func (c *cache) IncrementInt8(k string, n int8) (int8, error) {
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("Item %s not found", k)
-	}
-	rv, ok := v.Object.(int8)
-	if !ok {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("The value for %s is not an int8", k)
-	}
-	nv := rv + n
-	v.Object = nv
-	c.items[k] = v
-	c.mu.Unlock()
-	return nv, nil
-}
-
-// Increment an item of type int16 by n. Returns an error if the item's value is
-// not an int16, or if it was not found. If there is no error, the incremented
-// value is returned.
-func (c *cache) IncrementInt16(k string, n int16) (int16, error) {
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("Item %s not found", k)
-	}
-	rv, ok := v.Object.(int16)
-	if !ok {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("The value for %s is not an int16", k)
-	}
-	nv := rv + n
-	v.Object = nv
-	c.items[k] = v
-	c.mu.Unlock()
-	return nv, nil
-}
-
-// Increment an item of type int32 by n. Returns an error if the item's value is
-// not an int32, or if it was not found. If there is no error, the incremented
-// value is returned.
-func (c *cache) IncrementInt32(k string, n int32) (int32, error) {
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("Item %s not found", k)
-	}
-	rv, ok := v.Object.(int32)
-	if !ok {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("The value for %s is not an int32", k)
-	}
-	nv := rv + n
-	v.Object = nv
-	c.items[k] = v
-	c.mu.Unlock()
-	return nv, nil
-}
-
-// Increment an item of type int64 by n. Returns an error if the item's value is
-// not an int64, or if it was not found. If there is no error, the incremented
-// value is returned.
-func (c *cache) IncrementInt64(k string, n int64) (int64, error) {
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("Item %s not found", k)
-	}
-	rv, ok := v.Object.(int64)
-	if !ok {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("The value for %s is not an int64", k)
-	}
-	nv := rv + n
-	v.Object = nv
-	c.items[k] = v
-	c.mu.Unlock()
-	return nv, nil
-}
-
-// Increment an item of type uint by n. Returns an error if the item's value is
-// not an uint, or if it was not found. If there is no error, the incremented
-// value is returned.
-func (c *cache) IncrementUint(k string, n uint) (uint, error) {
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("Item %s not found", k)
-	}
-	rv, ok := v.Object.(uint)
-	if !ok {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("The value for %s is not an uint", k)
-	}
-	nv := rv + n
-	v.Object = nv
-	c.items[k] = v
-	c.mu.Unlock()
-	return nv, nil
-}
-
-// Increment an item of type uintptr by n. Returns an error if the item's value
-// is not an uintptr, or if it was not found. If there is no error, the
-// incremented value is returned.
-func (c *cache) IncrementUintptr(k string, n uintptr) (uintptr, error) {
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("Item %s not found", k)
-	}
-	rv, ok := v.Object.(uintptr)
-	if !ok {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("The value for %s is not an uintptr", k)
-	}
-	nv := rv + n
-	v.Object = nv
-	c.items[k] = v
-	c.mu.Unlock()
-	return nv, nil
-}
-
-// Increment an item of type uint8 by n. Returns an error if the item's value
-// is not an uint8, or if it was not found. If there is no error, the
-// incremented value is returned.
-func (c *cache) IncrementUint8(k string, n uint8) (uint8, error) {
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("Item %s not found", k)
-	}
-	rv, ok := v.Object.(uint8)
-	if !ok {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("The value for %s is not an uint8", k)
-	}
-	nv := rv + n
-	v.Object = nv
-	c.items[k] = v
-	c.mu.Unlock()
-	return nv, nil
-}
-
-// Increment an item of type uint16 by n. Returns an error if the item's value
-// is not an uint16, or if it was not found. If there is no error, the
-// incremented value is returned.
-func (c *cache) IncrementUint16(k string, n uint16) (uint16, error) {
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("Item %s not found", k)
-	}
-	rv, ok := v.Object.(uint16)
-	if !ok {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("The value for %s is not an uint16", k)
-	}
-	nv := rv + n
-	v.Object = nv
-	c.items[k] = v
-	c.mu.Unlock()
-	return nv, nil
-}
-
-// Increment an item of type uint32 by n. Returns an error if the item's value
-// is not an uint32, or if it was not found. If there is no error, the
-// incremented value is returned.
-func (c *cache) IncrementUint32(k string, n uint32) (uint32, error) {
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("Item %s not found", k)
-	}
-	rv, ok := v.Object.(uint32)
-	if !ok {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("The value for %s is not an uint32", k)
-	}
-	nv := rv + n
-	v.Object = nv
-	c.items[k] = v
-	c.mu.Unlock()
-	return nv, nil
-}
-
-// Increment an item of type uint64 by n. Returns an error if the item's value
-// is not an uint64, or if it was not found. If there is no error, the
-// incremented value is returned.
-func (c *cache) IncrementUint64(k string, n uint64) (uint64, error) {
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("Item %s not found", k)
-	}
-	rv, ok := v.Object.(uint64)
-	if !ok {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("The value for %s is not an uint64", k)
-	}
-	nv := rv + n
-	v.Object = nv
-	c.items[k] = v
-	c.mu.Unlock()
-	return nv, nil
-}
-
-// Increment an item of type float32 by n. Returns an error if the item's value
-// is not an float32, or if it was not found. If there is no error, the
-// incremented value is returned.
-func (c *cache) IncrementFloat32(k string, n float32) (float32, error) {
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("Item %s not found", k)
-	}
-	rv, ok := v.Object.(float32)
-	if !ok {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("The value for %s is not an float32", k)
-	}
-	nv := rv + n
-	v.Object = nv
-	c.items[k] = v
-	c.mu.Unlock()
-	return nv, nil
-}
-
-// Increment an item of type float64 by n. Returns an error if the item's value
-// is not an float64, or if it was not found. If there is no error, the
-// incremented value is returned.
-func (c *cache) IncrementFloat64(k string, n float64) (float64, error) {
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("Item %s not found", k)
-	}
-	rv, ok := v.Object.(float64)
-	if !ok {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("The value for %s is not an float64", k)
-	}
-	nv := rv + n
-	v.Object = nv
-	c.items[k] = v
-	c.mu.Unlock()
-	return nv, nil
-}
-
-// Decrement an item of type int, int8, int16, int32, int64, uintptr, uint,
-// uint8, uint32, or uint64, float32 or float64 by n. Returns an error if the
-// item's value is not an integer, if it was not found, or if it is not
-// possible to decrement it by n. To retrieve the decremented value, use one
-// of the specialized methods, e.g. DecrementInt64.
-func (c *cache) Decrement(k string, n int64) error {
-	// TODO: Implement Increment and Decrement more cleanly.
-	// (Cannot do Increment(k, n*-1) for uints.)
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return fmt.Errorf("Item not found")
-	}
-	switch v.Object.(type) {
-	case int:
-		v.Object = v.Object.(int) - int(n)
-	case int8:
-		v.Object = v.Object.(int8) - int8(n)
-	case int16:
-		v.Object = v.Object.(int16) - int16(n)
-	case int32:
-		v.Object = v.Object.(int32) - int32(n)
-	case int64:
-		v.Object = v.Object.(int64) - n
-	case uint:
-		v.Object = v.Object.(uint) - uint(n)
-	case uintptr:
-		v.Object = v.Object.(uintptr) - uintptr(n)
-	case uint8:
-		v.Object = v.Object.(uint8) - uint8(n)
-	case uint16:
-		v.Object = v.Object.(uint16) - uint16(n)
-	case uint32:
-		v.Object = v.Object.(uint32) - uint32(n)
-	case uint64:
-		v.Object = v.Object.(uint64) - uint64(n)
-	case float32:
-		v.Object = v.Object.(float32) - float32(n)
-	case float64:
-		v.Object = v.Object.(float64) - float64(n)
-	default:
-		c.mu.Unlock()
-		return fmt.Errorf("The value for %s is not an integer", k)
-	}
-	c.items[k] = v
-	c.mu.Unlock()
-	return nil
-}
-
-// Decrement an item of type float32 or float64 by n. Returns an error if the
-// item's value is not floating point, if it was not found, or if it is not
-// possible to decrement it by n. Pass a negative number to decrement the
-// value. To retrieve the decremented value, use one of the specialized methods,
-// e.g. DecrementFloat64.
-func (c *cache) DecrementFloat(k string, n float64) error {
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return fmt.Errorf("Item %s not found", k)
-	}
-	switch v.Object.(type) {
-	case float32:
-		v.Object = v.Object.(float32) - float32(n)
-	case float64:
-		v.Object = v.Object.(float64) - n
-	default:
-		c.mu.Unlock()
-		return fmt.Errorf("The value for %s does not have type float32 or float64", k)
-	}
-	c.items[k] = v
-	c.mu.Unlock()
-	return nil
-}
-
-// Decrement an item of type int by n. Returns an error if the item's value is
-// not an int, or if it was not found. If there is no error, the decremented
-// value is returned.
-func (c *cache) DecrementInt(k string, n int) (int, error) {
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("Item %s not found", k)
-	}
-	rv, ok := v.Object.(int)
-	if !ok {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("The value for %s is not an int", k)
-	}
-	nv := rv - n
-	v.Object = nv
-	c.items[k] = v
-	c.mu.Unlock()
-	return nv, nil
-}
-
-// Decrement an item of type int8 by n. Returns an error if the item's value is
-// not an int8, or if it was not found. If there is no error, the decremented
-// value is returned.
-func (c *cache) DecrementInt8(k string, n int8) (int8, error) {
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("Item %s not found", k)
-	}
-	rv, ok := v.Object.(int8)
-	if !ok {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("The value for %s is not an int8", k)
-	}
-	nv := rv - n
-	v.Object = nv
-	c.items[k] = v
-	c.mu.Unlock()
-	return nv, nil
-}
-
-// Decrement an item of type int16 by n. Returns an error if the item's value is
-// not an int16, or if it was not found. If there is no error, the decremented
-// value is returned.
-func (c *cache) DecrementInt16(k string, n int16) (int16, error) {
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("Item %s not found", k)
-	}
-	rv, ok := v.Object.(int16)
-	if !ok {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("The value for %s is not an int16", k)
-	}
-	nv := rv - n
-	v.Object = nv
-	c.items[k] = v
-	c.mu.Unlock()
-	return nv, nil
-}
-
-// Decrement an item of type int32 by n. Returns an error if the item's value is
-// not an int32, or if it was not found. If there is no error, the decremented
-// value is returned.
-func (c *cache) DecrementInt32(k string, n int32) (int32, error) {
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("Item %s not found", k)
-	}
-	rv, ok := v.Object.(int32)
-	if !ok {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("The value for %s is not an int32", k)
-	}
-	nv := rv - n
-	v.Object = nv
-	c.items[k] = v
-	c.mu.Unlock()
-	return nv, nil
-}
-
-// Decrement an item of type int64 by n. Returns an error if the item's value is
-// not an int64, or if it was not found. If there is no error, the decremented
-// value is returned.
-func (c *cache) DecrementInt64(k string, n int64) (int64, error) {
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("Item %s not found", k)
-	}
-	rv, ok := v.Object.(int64)
-	if !ok {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("The value for %s is not an int64", k)
-	}
-	nv := rv - n
-	v.Object = nv
-	c.items[k] = v
-	c.mu.Unlock()
-	return nv, nil
-}
-
-// Decrement an item of type uint by n. Returns an error if the item's value is
-// not an uint, or if it was not found. If there is no error, the decremented
-// value is returned.
-func (c *cache) DecrementUint(k string, n uint) (uint, error) {
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("Item %s not found", k)
-	}
-	rv, ok := v.Object.(uint)
-	if !ok {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("The value for %s is not an uint", k)
-	}
-	nv := rv - n
-	v.Object = nv
-	c.items[k] = v
-	c.mu.Unlock()
-	return nv, nil
-}
-
-// Decrement an item of type uintptr by n. Returns an error if the item's value
-// is not an uintptr, or if it was not found. If there is no error, the
-// decremented value is returned.
-func (c *cache) DecrementUintptr(k string, n uintptr) (uintptr, error) {
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("Item %s not found", k)
-	}
-	rv, ok := v.Object.(uintptr)
-	if !ok {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("The value for %s is not an uintptr", k)
-	}
-	nv := rv - n
-	v.Object = nv
-	c.items[k] = v
-	c.mu.Unlock()
-	return nv, nil
-}
-
-// Decrement an item of type uint8 by n. Returns an error if the item's value is
-// not an uint8, or if it was not found. If there is no error, the decremented
-// value is returned.
-func (c *cache) DecrementUint8(k string, n uint8) (uint8, error) {
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("Item %s not found", k)
-	}
-	rv, ok := v.Object.(uint8)
-	if !ok {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("The value for %s is not an uint8", k)
-	}
-	nv := rv - n
-	v.Object = nv
-	c.items[k] = v
-	c.mu.Unlock()
-	return nv, nil
-}
-
-// Decrement an item of type uint16 by n. Returns an error if the item's value
-// is not an uint16, or if it was not found. If there is no error, the
-// decremented value is returned.
-func (c *cache) DecrementUint16(k string, n uint16) (uint16, error) {
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("Item %s not found", k)
-	}
-	rv, ok := v.Object.(uint16)
-	if !ok {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("The value for %s is not an uint16", k)
-	}
-	nv := rv - n
-	v.Object = nv
-	c.items[k] = v
-	c.mu.Unlock()
-	return nv, nil
-}
-
-// Decrement an item of type uint32 by n. Returns an error if the item's value
-// is not an uint32, or if it was not found. If there is no error, the
-// decremented value is returned.
-func (c *cache) DecrementUint32(k string, n uint32) (uint32, error) {
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("Item %s not found", k)
-	}
-	rv, ok := v.Object.(uint32)
-	if !ok {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("The value for %s is not an uint32", k)
-	}
-	nv := rv - n
-	v.Object = nv
-	c.items[k] = v
-	c.mu.Unlock()
-	return nv, nil
-}
-
-// Decrement an item of type uint64 by n. Returns an error if the item's value
-// is not an uint64, or if it was not found. If there is no error, the
-// decremented value is returned.
-func (c *cache) DecrementUint64(k string, n uint64) (uint64, error) {
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("Item %s not found", k)
-	}
-	rv, ok := v.Object.(uint64)
-	if !ok {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("The value for %s is not an uint64", k)
-	}
-	nv := rv - n
-	v.Object = nv
-	c.items[k] = v
-	c.mu.Unlock()
-	return nv, nil
-}
-
-// Decrement an item of type float32 by n. Returns an error if the item's value
-// is not an float32, or if it was not found. If there is no error, the
-// decremented value is returned.
-func (c *cache) DecrementFloat32(k string, n float32) (float32, error) {
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("Item %s not found", k)
-	}
-	rv, ok := v.Object.(float32)
-	if !ok {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("The value for %s is not an float32", k)
-	}
-	nv := rv - n
-	v.Object = nv
-	c.items[k] = v
-	c.mu.Unlock()
-	return nv, nil
-}
-
-// Decrement an item of type float64 by n. Returns an error if the item's value
-// is not an float64, or if it was not found. If there is no error, the
-// decremented value is returned.
-func (c *cache) DecrementFloat64(k string, n float64) (float64, error) {
-	c.mu.Lock()
-	v, found := c.items[k]
-	if !found || v.Expired() {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("Item %s not found", k)
-	}
-	rv, ok := v.Object.(float64)
-	if !ok {
-		c.mu.Unlock()
-		return 0, fmt.Errorf("The value for %s is not an float64", k)
-	}
-	nv := rv - n
-	v.Object = nv
-	c.items[k] = v
-	c.mu.Unlock()
-	return nv, nil
+	return &item.Object, true
 }
 
 // Delete an item from the cache. Does nothing if the key is not in the cache.
-func (c *cache) Delete(k string) {
+func (c *cache[K, V]) Delete(k K) {
 	c.mu.Lock()
 	v, evicted := c.delete(k)
 	c.mu.Unlock()
 	if evicted {
-		c.onEvicted(k, v)
+		c.onEvicted(k, *v)
 	}
 }
 
-func (c *cache) delete(k string) (interface{}, bool) {
+func (c *cache[K, V]) delete(k K) (*V, bool) {
 	if c.onEvicted != nil {
 		if v, found := c.items[k]; found {
 			delete(c.items, k)
-			return v.Object, true
+			return &v.Object, true
 		}
 	}
 	delete(c.items, k)
 	return nil, false
 }
 
-type keyAndValue struct {
-	key   string
-	value interface{}
+type keyAndValue[K comparable, V any] struct {
+	key   K
+	value V
 }
 
 // Delete all expired items from the cache.
-func (c *cache) DeleteExpired() {
-	var evictedItems []keyAndValue
+func (c *cache[K, V]) DeleteExpired() {
+	var evictedItems []keyAndValue[K, V]
 	now := time.Now().UnixNano()
 	c.mu.Lock()
 	for k, v := range c.items {
@@ -937,7 +215,7 @@ func (c *cache) DeleteExpired() {
 		if v.Expiration > 0 && now > v.Expiration {
 			ov, evicted := c.delete(k)
 			if evicted {
-				evictedItems = append(evictedItems, keyAndValue{k, ov})
+				evictedItems = append(evictedItems, keyAndValue[K, V]{k, *ov})
 			}
 		}
 	}
@@ -950,7 +228,7 @@ func (c *cache) DeleteExpired() {
 // Sets an (optional) function that is called with the key and value when an
 // item is evicted from the cache. (Including when it is deleted manually, but
 // not when it is overwritten.) Set to nil to disable.
-func (c *cache) OnEvicted(f func(string, interface{})) {
+func (c *cache[K, V]) OnEvicted(f func(K, V)) {
 	c.mu.Lock()
 	c.onEvicted = f
 	c.mu.Unlock()
@@ -960,7 +238,7 @@ func (c *cache) OnEvicted(f func(string, interface{})) {
 //
 // NOTE: This method is deprecated in favor of c.Items() and NewFrom() (see the
 // documentation for NewFrom().)
-func (c *cache) Save(w io.Writer) (err error) {
+func (c *cache[K, V]) Save(w io.Writer) (err error) {
 	enc := gob.NewEncoder(w)
 	defer func() {
 		if x := recover(); x != nil {
@@ -981,7 +259,7 @@ func (c *cache) Save(w io.Writer) (err error) {
 //
 // NOTE: This method is deprecated in favor of c.Items() and NewFrom() (see the
 // documentation for NewFrom().)
-func (c *cache) SaveFile(fname string) error {
+func (c *cache[K, V]) SaveFile(fname string) error {
 	fp, err := os.Create(fname)
 	if err != nil {
 		return err
@@ -999,9 +277,9 @@ func (c *cache) SaveFile(fname string) error {
 //
 // NOTE: This method is deprecated in favor of c.Items() and NewFrom() (see the
 // documentation for NewFrom().)
-func (c *cache) Load(r io.Reader) error {
+func (c *cache[K, V]) Load(r io.Reader) error {
 	dec := gob.NewDecoder(r)
-	items := map[string]Item{}
+	items := map[K]Item[V]{}
 	err := dec.Decode(&items)
 	if err == nil {
 		c.mu.Lock()
@@ -1021,7 +299,7 @@ func (c *cache) Load(r io.Reader) error {
 //
 // NOTE: This method is deprecated in favor of c.Items() and NewFrom() (see the
 // documentation for NewFrom().)
-func (c *cache) LoadFile(fname string) error {
+func (c *cache[K, V]) LoadFile(fname string) error {
 	fp, err := os.Open(fname)
 	if err != nil {
 		return err
@@ -1035,10 +313,10 @@ func (c *cache) LoadFile(fname string) error {
 }
 
 // Copies all unexpired items in the cache into a new map and returns it.
-func (c *cache) Items() map[string]Item {
+func (c *cache[K, V]) Items() map[K]Item[V] {
 	c.mu.RLock()
 	defer c.mu.RUnlock()
-	m := make(map[string]Item, len(c.items))
+	m := make(map[K]Item[V], len(c.items))
 	now := time.Now().UnixNano()
 	for k, v := range c.items {
 		// "Inlining" of Expired
@@ -1054,7 +332,7 @@ func (c *cache) Items() map[string]Item {
 
 // Returns the number of items in the cache. This may include items that have
 // expired, but have not yet been cleaned up.
-func (c *cache) ItemCount() int {
+func (c *cache[K, V]) ItemCount() int {
 	c.mu.RLock()
 	n := len(c.items)
 	c.mu.RUnlock()
@@ -1062,18 +340,18 @@ func (c *cache) ItemCount() int {
 }
 
 // Delete all items from the cache.
-func (c *cache) Flush() {
+func (c *cache[K, V]) Flush() {
 	c.mu.Lock()
-	c.items = map[string]Item{}
+	c.items = map[K]Item[V]{}
 	c.mu.Unlock()
 }
 
-type janitor struct {
+type janitor[K comparable, V any] struct {
 	Interval time.Duration
 	stop     chan bool
 }
 
-func (j *janitor) Run(c *cache) {
+func (j *janitor[K, V]) Run(c *cache[K, V]) {
 	ticker := time.NewTicker(j.Interval)
 	for {
 		select {
@@ -1086,12 +364,12 @@ func (j *janitor) Run(c *cache) {
 	}
 }
 
-func stopJanitor(c *Cache) {
+func stopJanitor[K comparable, V any](c *Cache[K, V]) {
 	c.janitor.stop <- true
 }
 
-func runJanitor(c *cache, ci time.Duration) {
-	j := &janitor{
+func runJanitor[K comparable, V any](c *cache[K, V], ci time.Duration) {
+	j := &janitor[K, V]{
 		Interval: ci,
 		stop:     make(chan bool),
 	}
@@ -1099,28 +377,28 @@ func runJanitor(c *cache, ci time.Duration) {
 	go j.Run(c)
 }
 
-func newCache(de time.Duration, m map[string]Item) *cache {
+func newCache[K comparable, V any](de time.Duration, m map[K]Item[V]) *cache[K, V] {
 	if de == 0 {
 		de = -1
 	}
-	c := &cache{
+	c := &cache[K, V]{
 		defaultExpiration: de,
 		items:             m,
 	}
 	return c
 }
 
-func newCacheWithJanitor(de time.Duration, ci time.Duration, m map[string]Item) *Cache {
+func newCacheWithJanitor[K comparable, V any](de time.Duration, ci time.Duration, m map[K]Item[V]) *Cache[K, V] {
 	c := newCache(de, m)
 	// This trick ensures that the janitor goroutine (which--granted it
 	// was enabled--is running DeleteExpired on c forever) does not keep
 	// the returned C object from being garbage collected. When it is
 	// garbage collected, the finalizer stops the janitor goroutine, after
 	// which c can be collected.
-	C := &Cache{c}
+	C := &Cache[K, V]{c}
 	if ci > 0 {
 		runJanitor(c, ci)
-		runtime.SetFinalizer(C, stopJanitor)
+		runtime.SetFinalizer(C, stopJanitor[K, V])
 	}
 	return C
 }
@@ -1130,8 +408,8 @@ func newCacheWithJanitor(de time.Duration, ci time.Duration, m map[string]Item)
 // the items in the cache never expire (by default), and must be deleted
 // manually. If the cleanup interval is less than one, expired items are not
 // deleted from the cache before calling c.DeleteExpired().
-func New(defaultExpiration, cleanupInterval time.Duration) *Cache {
-	items := make(map[string]Item)
+func New[K comparable, V any](defaultExpiration, cleanupInterval time.Duration) *Cache[K, V] {
+	items := make(map[K]Item[V])
 	return newCacheWithJanitor(defaultExpiration, cleanupInterval, items)
 }
 
@@ -1144,7 +422,7 @@ func New(defaultExpiration, cleanupInterval time.Duration) *Cache {
 // NewFrom() also accepts an items map which will serve as the underlying map
 // for the cache. This is useful for starting from a deserialized cache
 // (serialized using e.g. gob.Encode() on c.Items()), or passing in e.g.
-// make(map[string]Item, 500) to improve startup performance when the cache
+// make(map[string]Item[int], 500) to improve startup performance when the cache
 // is expected to reach a certain minimum size.
 //
 // Only the cache's methods synchronize access to this map, so it is not
@@ -1156,6 +434,6 @@ func New(defaultExpiration, cleanupInterval time.Duration) *Cache {
 // gob.Register() the individual types stored in the cache before encoding a
 // map retrieved with c.Items(), and to register those same types before
 // decoding a blob containing an items map.
-func NewFrom(defaultExpiration, cleanupInterval time.Duration, items map[string]Item) *Cache {
+func NewFrom[K comparable, V any](defaultExpiration, cleanupInterval time.Duration, items map[K]Item[V]) *Cache[K, V] {
 	return newCacheWithJanitor(defaultExpiration, cleanupInterval, items)
 }
diff --git a/cache_test.go b/cache_test.go
index de3e9d6..84ebefa 100644
--- a/cache_test.go
+++ b/cache_test.go
@@ -16,7 +16,7 @@ type TestStruct struct {
 }
 
 func TestCache(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
+	tc := New[string, int](DefaultExpiration, 0)
 
 	a, found := tc.Get("a")
 	if found || a != nil {
@@ -34,8 +34,6 @@ func TestCache(t *testing.T) {
 	}
 
 	tc.Set("a", 1, DefaultExpiration)
-	tc.Set("b", "b", DefaultExpiration)
-	tc.Set("c", 3.5, DefaultExpiration)
 
 	x, found := tc.Get("a")
 	if !found {
@@ -43,35 +41,15 @@ func TestCache(t *testing.T) {
 	}
 	if x == nil {
 		t.Error("x for a is nil")
-	} else if a2 := x.(int); a2+2 != 3 {
+	} else if a2 := *x; a2+2 != 3 {
 		t.Error("a2 (which should be 1) plus 2 does not equal 3; value:", a2)
 	}
-
-	x, found = tc.Get("b")
-	if !found {
-		t.Error("b was not found while getting b2")
-	}
-	if x == nil {
-		t.Error("x for b is nil")
-	} else if b2 := x.(string); b2+"B" != "bB" {
-		t.Error("b2 (which should be b) plus B does not equal bB; value:", b2)
-	}
-
-	x, found = tc.Get("c")
-	if !found {
-		t.Error("c was not found while getting c2")
-	}
-	if x == nil {
-		t.Error("x for c is nil")
-	} else if c2 := x.(float64); c2+1.2 != 4.7 {
-		t.Error("c2 (which should be 3.5) plus 1.2 does not equal 4.7; value:", c2)
-	}
 }
 
 func TestCacheTimes(t *testing.T) {
 	var found bool
 
-	tc := New(50*time.Millisecond, 1*time.Millisecond)
+	tc := New[string, int](50*time.Millisecond, 1*time.Millisecond)
 	tc.Set("a", 1, DefaultExpiration)
 	tc.Set("b", 2, NoExpiration)
 	tc.Set("c", 3, 20*time.Millisecond)
@@ -107,12 +85,12 @@ func TestCacheTimes(t *testing.T) {
 }
 
 func TestNewFrom(t *testing.T) {
-	m := map[string]Item{
-		"a": Item{
+	m := map[string]Item[int]{
+		"a": {
 			Object:     1,
 			Expiration: 0,
 		},
-		"b": Item{
+		"b": {
 			Object:     2,
 			Expiration: 0,
 		},
@@ -122,998 +100,38 @@ func TestNewFrom(t *testing.T) {
 	if !found {
 		t.Fatal("Did not find a")
 	}
-	if a.(int) != 1 {
+	if *a != 1 {
 		t.Fatal("a is not 1")
 	}
 	b, found := tc.Get("b")
 	if !found {
 		t.Fatal("Did not find b")
 	}
-	if b.(int) != 2 {
+	if *b != 2 {
 		t.Fatal("b is not 2")
 	}
 }
 
 func TestStorePointerToStruct(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
+	tc := New[string, *TestStruct](DefaultExpiration, 0)
 	tc.Set("foo", &TestStruct{Num: 1}, DefaultExpiration)
 	x, found := tc.Get("foo")
 	if !found {
 		t.Fatal("*TestStruct was not found for foo")
 	}
-	foo := x.(*TestStruct)
-	foo.Num++
+	(*x).Num++
 
 	y, found := tc.Get("foo")
 	if !found {
 		t.Fatal("*TestStruct was not found for foo (second time)")
 	}
-	bar := y.(*TestStruct)
-	if bar.Num != 2 {
+	if (*y).Num != 2 {
 		t.Fatal("TestStruct.Num is not 2")
 	}
 }
 
-func TestIncrementWithInt(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("tint", 1, DefaultExpiration)
-	err := tc.Increment("tint", 2)
-	if err != nil {
-		t.Error("Error incrementing:", err)
-	}
-	x, found := tc.Get("tint")
-	if !found {
-		t.Error("tint was not found")
-	}
-	if x.(int) != 3 {
-		t.Error("tint is not 3:", x)
-	}
-}
-
-func TestIncrementWithInt8(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("tint8", int8(1), DefaultExpiration)
-	err := tc.Increment("tint8", 2)
-	if err != nil {
-		t.Error("Error incrementing:", err)
-	}
-	x, found := tc.Get("tint8")
-	if !found {
-		t.Error("tint8 was not found")
-	}
-	if x.(int8) != 3 {
-		t.Error("tint8 is not 3:", x)
-	}
-}
-
-func TestIncrementWithInt16(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("tint16", int16(1), DefaultExpiration)
-	err := tc.Increment("tint16", 2)
-	if err != nil {
-		t.Error("Error incrementing:", err)
-	}
-	x, found := tc.Get("tint16")
-	if !found {
-		t.Error("tint16 was not found")
-	}
-	if x.(int16) != 3 {
-		t.Error("tint16 is not 3:", x)
-	}
-}
-
-func TestIncrementWithInt32(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("tint32", int32(1), DefaultExpiration)
-	err := tc.Increment("tint32", 2)
-	if err != nil {
-		t.Error("Error incrementing:", err)
-	}
-	x, found := tc.Get("tint32")
-	if !found {
-		t.Error("tint32 was not found")
-	}
-	if x.(int32) != 3 {
-		t.Error("tint32 is not 3:", x)
-	}
-}
-
-func TestIncrementWithInt64(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("tint64", int64(1), DefaultExpiration)
-	err := tc.Increment("tint64", 2)
-	if err != nil {
-		t.Error("Error incrementing:", err)
-	}
-	x, found := tc.Get("tint64")
-	if !found {
-		t.Error("tint64 was not found")
-	}
-	if x.(int64) != 3 {
-		t.Error("tint64 is not 3:", x)
-	}
-}
-
-func TestIncrementWithUint(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("tuint", uint(1), DefaultExpiration)
-	err := tc.Increment("tuint", 2)
-	if err != nil {
-		t.Error("Error incrementing:", err)
-	}
-	x, found := tc.Get("tuint")
-	if !found {
-		t.Error("tuint was not found")
-	}
-	if x.(uint) != 3 {
-		t.Error("tuint is not 3:", x)
-	}
-}
-
-func TestIncrementWithUintptr(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("tuintptr", uintptr(1), DefaultExpiration)
-	err := tc.Increment("tuintptr", 2)
-	if err != nil {
-		t.Error("Error incrementing:", err)
-	}
-
-	x, found := tc.Get("tuintptr")
-	if !found {
-		t.Error("tuintptr was not found")
-	}
-	if x.(uintptr) != 3 {
-		t.Error("tuintptr is not 3:", x)
-	}
-}
-
-func TestIncrementWithUint8(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("tuint8", uint8(1), DefaultExpiration)
-	err := tc.Increment("tuint8", 2)
-	if err != nil {
-		t.Error("Error incrementing:", err)
-	}
-	x, found := tc.Get("tuint8")
-	if !found {
-		t.Error("tuint8 was not found")
-	}
-	if x.(uint8) != 3 {
-		t.Error("tuint8 is not 3:", x)
-	}
-}
-
-func TestIncrementWithUint16(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("tuint16", uint16(1), DefaultExpiration)
-	err := tc.Increment("tuint16", 2)
-	if err != nil {
-		t.Error("Error incrementing:", err)
-	}
-
-	x, found := tc.Get("tuint16")
-	if !found {
-		t.Error("tuint16 was not found")
-	}
-	if x.(uint16) != 3 {
-		t.Error("tuint16 is not 3:", x)
-	}
-}
-
-func TestIncrementWithUint32(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("tuint32", uint32(1), DefaultExpiration)
-	err := tc.Increment("tuint32", 2)
-	if err != nil {
-		t.Error("Error incrementing:", err)
-	}
-	x, found := tc.Get("tuint32")
-	if !found {
-		t.Error("tuint32 was not found")
-	}
-	if x.(uint32) != 3 {
-		t.Error("tuint32 is not 3:", x)
-	}
-}
-
-func TestIncrementWithUint64(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("tuint64", uint64(1), DefaultExpiration)
-	err := tc.Increment("tuint64", 2)
-	if err != nil {
-		t.Error("Error incrementing:", err)
-	}
-
-	x, found := tc.Get("tuint64")
-	if !found {
-		t.Error("tuint64 was not found")
-	}
-	if x.(uint64) != 3 {
-		t.Error("tuint64 is not 3:", x)
-	}
-}
-
-func TestIncrementWithFloat32(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("float32", float32(1.5), DefaultExpiration)
-	err := tc.Increment("float32", 2)
-	if err != nil {
-		t.Error("Error incrementing:", err)
-	}
-	x, found := tc.Get("float32")
-	if !found {
-		t.Error("float32 was not found")
-	}
-	if x.(float32) != 3.5 {
-		t.Error("float32 is not 3.5:", x)
-	}
-}
-
-func TestIncrementWithFloat64(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("float64", float64(1.5), DefaultExpiration)
-	err := tc.Increment("float64", 2)
-	if err != nil {
-		t.Error("Error incrementing:", err)
-	}
-	x, found := tc.Get("float64")
-	if !found {
-		t.Error("float64 was not found")
-	}
-	if x.(float64) != 3.5 {
-		t.Error("float64 is not 3.5:", x)
-	}
-}
-
-func TestIncrementFloatWithFloat32(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("float32", float32(1.5), DefaultExpiration)
-	err := tc.IncrementFloat("float32", 2)
-	if err != nil {
-		t.Error("Error incrementfloating:", err)
-	}
-	x, found := tc.Get("float32")
-	if !found {
-		t.Error("float32 was not found")
-	}
-	if x.(float32) != 3.5 {
-		t.Error("float32 is not 3.5:", x)
-	}
-}
-
-func TestIncrementFloatWithFloat64(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("float64", float64(1.5), DefaultExpiration)
-	err := tc.IncrementFloat("float64", 2)
-	if err != nil {
-		t.Error("Error incrementfloating:", err)
-	}
-	x, found := tc.Get("float64")
-	if !found {
-		t.Error("float64 was not found")
-	}
-	if x.(float64) != 3.5 {
-		t.Error("float64 is not 3.5:", x)
-	}
-}
-
-func TestDecrementWithInt(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("int", int(5), DefaultExpiration)
-	err := tc.Decrement("int", 2)
-	if err != nil {
-		t.Error("Error decrementing:", err)
-	}
-	x, found := tc.Get("int")
-	if !found {
-		t.Error("int was not found")
-	}
-	if x.(int) != 3 {
-		t.Error("int is not 3:", x)
-	}
-}
-
-func TestDecrementWithInt8(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("int8", int8(5), DefaultExpiration)
-	err := tc.Decrement("int8", 2)
-	if err != nil {
-		t.Error("Error decrementing:", err)
-	}
-	x, found := tc.Get("int8")
-	if !found {
-		t.Error("int8 was not found")
-	}
-	if x.(int8) != 3 {
-		t.Error("int8 is not 3:", x)
-	}
-}
-
-func TestDecrementWithInt16(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("int16", int16(5), DefaultExpiration)
-	err := tc.Decrement("int16", 2)
-	if err != nil {
-		t.Error("Error decrementing:", err)
-	}
-	x, found := tc.Get("int16")
-	if !found {
-		t.Error("int16 was not found")
-	}
-	if x.(int16) != 3 {
-		t.Error("int16 is not 3:", x)
-	}
-}
-
-func TestDecrementWithInt32(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("int32", int32(5), DefaultExpiration)
-	err := tc.Decrement("int32", 2)
-	if err != nil {
-		t.Error("Error decrementing:", err)
-	}
-	x, found := tc.Get("int32")
-	if !found {
-		t.Error("int32 was not found")
-	}
-	if x.(int32) != 3 {
-		t.Error("int32 is not 3:", x)
-	}
-}
-
-func TestDecrementWithInt64(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("int64", int64(5), DefaultExpiration)
-	err := tc.Decrement("int64", 2)
-	if err != nil {
-		t.Error("Error decrementing:", err)
-	}
-	x, found := tc.Get("int64")
-	if !found {
-		t.Error("int64 was not found")
-	}
-	if x.(int64) != 3 {
-		t.Error("int64 is not 3:", x)
-	}
-}
-
-func TestDecrementWithUint(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("uint", uint(5), DefaultExpiration)
-	err := tc.Decrement("uint", 2)
-	if err != nil {
-		t.Error("Error decrementing:", err)
-	}
-	x, found := tc.Get("uint")
-	if !found {
-		t.Error("uint was not found")
-	}
-	if x.(uint) != 3 {
-		t.Error("uint is not 3:", x)
-	}
-}
-
-func TestDecrementWithUintptr(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("uintptr", uintptr(5), DefaultExpiration)
-	err := tc.Decrement("uintptr", 2)
-	if err != nil {
-		t.Error("Error decrementing:", err)
-	}
-	x, found := tc.Get("uintptr")
-	if !found {
-		t.Error("uintptr was not found")
-	}
-	if x.(uintptr) != 3 {
-		t.Error("uintptr is not 3:", x)
-	}
-}
-
-func TestDecrementWithUint8(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("uint8", uint8(5), DefaultExpiration)
-	err := tc.Decrement("uint8", 2)
-	if err != nil {
-		t.Error("Error decrementing:", err)
-	}
-	x, found := tc.Get("uint8")
-	if !found {
-		t.Error("uint8 was not found")
-	}
-	if x.(uint8) != 3 {
-		t.Error("uint8 is not 3:", x)
-	}
-}
-
-func TestDecrementWithUint16(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("uint16", uint16(5), DefaultExpiration)
-	err := tc.Decrement("uint16", 2)
-	if err != nil {
-		t.Error("Error decrementing:", err)
-	}
-	x, found := tc.Get("uint16")
-	if !found {
-		t.Error("uint16 was not found")
-	}
-	if x.(uint16) != 3 {
-		t.Error("uint16 is not 3:", x)
-	}
-}
-
-func TestDecrementWithUint32(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("uint32", uint32(5), DefaultExpiration)
-	err := tc.Decrement("uint32", 2)
-	if err != nil {
-		t.Error("Error decrementing:", err)
-	}
-	x, found := tc.Get("uint32")
-	if !found {
-		t.Error("uint32 was not found")
-	}
-	if x.(uint32) != 3 {
-		t.Error("uint32 is not 3:", x)
-	}
-}
-
-func TestDecrementWithUint64(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("uint64", uint64(5), DefaultExpiration)
-	err := tc.Decrement("uint64", 2)
-	if err != nil {
-		t.Error("Error decrementing:", err)
-	}
-	x, found := tc.Get("uint64")
-	if !found {
-		t.Error("uint64 was not found")
-	}
-	if x.(uint64) != 3 {
-		t.Error("uint64 is not 3:", x)
-	}
-}
-
-func TestDecrementWithFloat32(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("float32", float32(5.5), DefaultExpiration)
-	err := tc.Decrement("float32", 2)
-	if err != nil {
-		t.Error("Error decrementing:", err)
-	}
-	x, found := tc.Get("float32")
-	if !found {
-		t.Error("float32 was not found")
-	}
-	if x.(float32) != 3.5 {
-		t.Error("float32 is not 3:", x)
-	}
-}
-
-func TestDecrementWithFloat64(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("float64", float64(5.5), DefaultExpiration)
-	err := tc.Decrement("float64", 2)
-	if err != nil {
-		t.Error("Error decrementing:", err)
-	}
-	x, found := tc.Get("float64")
-	if !found {
-		t.Error("float64 was not found")
-	}
-	if x.(float64) != 3.5 {
-		t.Error("float64 is not 3:", x)
-	}
-}
-
-func TestDecrementFloatWithFloat32(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("float32", float32(5.5), DefaultExpiration)
-	err := tc.DecrementFloat("float32", 2)
-	if err != nil {
-		t.Error("Error decrementing:", err)
-	}
-	x, found := tc.Get("float32")
-	if !found {
-		t.Error("float32 was not found")
-	}
-	if x.(float32) != 3.5 {
-		t.Error("float32 is not 3:", x)
-	}
-}
-
-func TestDecrementFloatWithFloat64(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("float64", float64(5.5), DefaultExpiration)
-	err := tc.DecrementFloat("float64", 2)
-	if err != nil {
-		t.Error("Error decrementing:", err)
-	}
-	x, found := tc.Get("float64")
-	if !found {
-		t.Error("float64 was not found")
-	}
-	if x.(float64) != 3.5 {
-		t.Error("float64 is not 3:", x)
-	}
-}
-
-func TestIncrementInt(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("tint", 1, DefaultExpiration)
-	n, err := tc.IncrementInt("tint", 2)
-	if err != nil {
-		t.Error("Error incrementing:", err)
-	}
-	if n != 3 {
-		t.Error("Returned number is not 3:", n)
-	}
-	x, found := tc.Get("tint")
-	if !found {
-		t.Error("tint was not found")
-	}
-	if x.(int) != 3 {
-		t.Error("tint is not 3:", x)
-	}
-}
-
-func TestIncrementInt8(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("tint8", int8(1), DefaultExpiration)
-	n, err := tc.IncrementInt8("tint8", 2)
-	if err != nil {
-		t.Error("Error incrementing:", err)
-	}
-	if n != 3 {
-		t.Error("Returned number is not 3:", n)
-	}
-	x, found := tc.Get("tint8")
-	if !found {
-		t.Error("tint8 was not found")
-	}
-	if x.(int8) != 3 {
-		t.Error("tint8 is not 3:", x)
-	}
-}
-
-func TestIncrementInt16(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("tint16", int16(1), DefaultExpiration)
-	n, err := tc.IncrementInt16("tint16", 2)
-	if err != nil {
-		t.Error("Error incrementing:", err)
-	}
-	if n != 3 {
-		t.Error("Returned number is not 3:", n)
-	}
-	x, found := tc.Get("tint16")
-	if !found {
-		t.Error("tint16 was not found")
-	}
-	if x.(int16) != 3 {
-		t.Error("tint16 is not 3:", x)
-	}
-}
-
-func TestIncrementInt32(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("tint32", int32(1), DefaultExpiration)
-	n, err := tc.IncrementInt32("tint32", 2)
-	if err != nil {
-		t.Error("Error incrementing:", err)
-	}
-	if n != 3 {
-		t.Error("Returned number is not 3:", n)
-	}
-	x, found := tc.Get("tint32")
-	if !found {
-		t.Error("tint32 was not found")
-	}
-	if x.(int32) != 3 {
-		t.Error("tint32 is not 3:", x)
-	}
-}
-
-func TestIncrementInt64(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("tint64", int64(1), DefaultExpiration)
-	n, err := tc.IncrementInt64("tint64", 2)
-	if err != nil {
-		t.Error("Error incrementing:", err)
-	}
-	if n != 3 {
-		t.Error("Returned number is not 3:", n)
-	}
-	x, found := tc.Get("tint64")
-	if !found {
-		t.Error("tint64 was not found")
-	}
-	if x.(int64) != 3 {
-		t.Error("tint64 is not 3:", x)
-	}
-}
-
-func TestIncrementUint(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("tuint", uint(1), DefaultExpiration)
-	n, err := tc.IncrementUint("tuint", 2)
-	if err != nil {
-		t.Error("Error incrementing:", err)
-	}
-	if n != 3 {
-		t.Error("Returned number is not 3:", n)
-	}
-	x, found := tc.Get("tuint")
-	if !found {
-		t.Error("tuint was not found")
-	}
-	if x.(uint) != 3 {
-		t.Error("tuint is not 3:", x)
-	}
-}
-
-func TestIncrementUintptr(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("tuintptr", uintptr(1), DefaultExpiration)
-	n, err := tc.IncrementUintptr("tuintptr", 2)
-	if err != nil {
-		t.Error("Error incrementing:", err)
-	}
-	if n != 3 {
-		t.Error("Returned number is not 3:", n)
-	}
-	x, found := tc.Get("tuintptr")
-	if !found {
-		t.Error("tuintptr was not found")
-	}
-	if x.(uintptr) != 3 {
-		t.Error("tuintptr is not 3:", x)
-	}
-}
-
-func TestIncrementUint8(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("tuint8", uint8(1), DefaultExpiration)
-	n, err := tc.IncrementUint8("tuint8", 2)
-	if err != nil {
-		t.Error("Error incrementing:", err)
-	}
-	if n != 3 {
-		t.Error("Returned number is not 3:", n)
-	}
-	x, found := tc.Get("tuint8")
-	if !found {
-		t.Error("tuint8 was not found")
-	}
-	if x.(uint8) != 3 {
-		t.Error("tuint8 is not 3:", x)
-	}
-}
-
-func TestIncrementUint16(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("tuint16", uint16(1), DefaultExpiration)
-	n, err := tc.IncrementUint16("tuint16", 2)
-	if err != nil {
-		t.Error("Error incrementing:", err)
-	}
-	if n != 3 {
-		t.Error("Returned number is not 3:", n)
-	}
-	x, found := tc.Get("tuint16")
-	if !found {
-		t.Error("tuint16 was not found")
-	}
-	if x.(uint16) != 3 {
-		t.Error("tuint16 is not 3:", x)
-	}
-}
-
-func TestIncrementUint32(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("tuint32", uint32(1), DefaultExpiration)
-	n, err := tc.IncrementUint32("tuint32", 2)
-	if err != nil {
-		t.Error("Error incrementing:", err)
-	}
-	if n != 3 {
-		t.Error("Returned number is not 3:", n)
-	}
-	x, found := tc.Get("tuint32")
-	if !found {
-		t.Error("tuint32 was not found")
-	}
-	if x.(uint32) != 3 {
-		t.Error("tuint32 is not 3:", x)
-	}
-}
-
-func TestIncrementUint64(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("tuint64", uint64(1), DefaultExpiration)
-	n, err := tc.IncrementUint64("tuint64", 2)
-	if err != nil {
-		t.Error("Error incrementing:", err)
-	}
-	if n != 3 {
-		t.Error("Returned number is not 3:", n)
-	}
-	x, found := tc.Get("tuint64")
-	if !found {
-		t.Error("tuint64 was not found")
-	}
-	if x.(uint64) != 3 {
-		t.Error("tuint64 is not 3:", x)
-	}
-}
-
-func TestIncrementFloat32(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("float32", float32(1.5), DefaultExpiration)
-	n, err := tc.IncrementFloat32("float32", 2)
-	if err != nil {
-		t.Error("Error incrementing:", err)
-	}
-	if n != 3.5 {
-		t.Error("Returned number is not 3.5:", n)
-	}
-	x, found := tc.Get("float32")
-	if !found {
-		t.Error("float32 was not found")
-	}
-	if x.(float32) != 3.5 {
-		t.Error("float32 is not 3.5:", x)
-	}
-}
-
-func TestIncrementFloat64(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("float64", float64(1.5), DefaultExpiration)
-	n, err := tc.IncrementFloat64("float64", 2)
-	if err != nil {
-		t.Error("Error incrementing:", err)
-	}
-	if n != 3.5 {
-		t.Error("Returned number is not 3.5:", n)
-	}
-	x, found := tc.Get("float64")
-	if !found {
-		t.Error("float64 was not found")
-	}
-	if x.(float64) != 3.5 {
-		t.Error("float64 is not 3.5:", x)
-	}
-}
-
-func TestDecrementInt8(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("int8", int8(5), DefaultExpiration)
-	n, err := tc.DecrementInt8("int8", 2)
-	if err != nil {
-		t.Error("Error decrementing:", err)
-	}
-	if n != 3 {
-		t.Error("Returned number is not 3:", n)
-	}
-	x, found := tc.Get("int8")
-	if !found {
-		t.Error("int8 was not found")
-	}
-	if x.(int8) != 3 {
-		t.Error("int8 is not 3:", x)
-	}
-}
-
-func TestDecrementInt16(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("int16", int16(5), DefaultExpiration)
-	n, err := tc.DecrementInt16("int16", 2)
-	if err != nil {
-		t.Error("Error decrementing:", err)
-	}
-	if n != 3 {
-		t.Error("Returned number is not 3:", n)
-	}
-	x, found := tc.Get("int16")
-	if !found {
-		t.Error("int16 was not found")
-	}
-	if x.(int16) != 3 {
-		t.Error("int16 is not 3:", x)
-	}
-}
-
-func TestDecrementInt32(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("int32", int32(5), DefaultExpiration)
-	n, err := tc.DecrementInt32("int32", 2)
-	if err != nil {
-		t.Error("Error decrementing:", err)
-	}
-	if n != 3 {
-		t.Error("Returned number is not 3:", n)
-	}
-	x, found := tc.Get("int32")
-	if !found {
-		t.Error("int32 was not found")
-	}
-	if x.(int32) != 3 {
-		t.Error("int32 is not 3:", x)
-	}
-}
-
-func TestDecrementInt64(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("int64", int64(5), DefaultExpiration)
-	n, err := tc.DecrementInt64("int64", 2)
-	if err != nil {
-		t.Error("Error decrementing:", err)
-	}
-	if n != 3 {
-		t.Error("Returned number is not 3:", n)
-	}
-	x, found := tc.Get("int64")
-	if !found {
-		t.Error("int64 was not found")
-	}
-	if x.(int64) != 3 {
-		t.Error("int64 is not 3:", x)
-	}
-}
-
-func TestDecrementUint(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("uint", uint(5), DefaultExpiration)
-	n, err := tc.DecrementUint("uint", 2)
-	if err != nil {
-		t.Error("Error decrementing:", err)
-	}
-	if n != 3 {
-		t.Error("Returned number is not 3:", n)
-	}
-	x, found := tc.Get("uint")
-	if !found {
-		t.Error("uint was not found")
-	}
-	if x.(uint) != 3 {
-		t.Error("uint is not 3:", x)
-	}
-}
-
-func TestDecrementUintptr(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("uintptr", uintptr(5), DefaultExpiration)
-	n, err := tc.DecrementUintptr("uintptr", 2)
-	if err != nil {
-		t.Error("Error decrementing:", err)
-	}
-	if n != 3 {
-		t.Error("Returned number is not 3:", n)
-	}
-	x, found := tc.Get("uintptr")
-	if !found {
-		t.Error("uintptr was not found")
-	}
-	if x.(uintptr) != 3 {
-		t.Error("uintptr is not 3:", x)
-	}
-}
-
-func TestDecrementUint8(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("uint8", uint8(5), DefaultExpiration)
-	n, err := tc.DecrementUint8("uint8", 2)
-	if err != nil {
-		t.Error("Error decrementing:", err)
-	}
-	if n != 3 {
-		t.Error("Returned number is not 3:", n)
-	}
-	x, found := tc.Get("uint8")
-	if !found {
-		t.Error("uint8 was not found")
-	}
-	if x.(uint8) != 3 {
-		t.Error("uint8 is not 3:", x)
-	}
-}
-
-func TestDecrementUint16(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("uint16", uint16(5), DefaultExpiration)
-	n, err := tc.DecrementUint16("uint16", 2)
-	if err != nil {
-		t.Error("Error decrementing:", err)
-	}
-	if n != 3 {
-		t.Error("Returned number is not 3:", n)
-	}
-	x, found := tc.Get("uint16")
-	if !found {
-		t.Error("uint16 was not found")
-	}
-	if x.(uint16) != 3 {
-		t.Error("uint16 is not 3:", x)
-	}
-}
-
-func TestDecrementUint32(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("uint32", uint32(5), DefaultExpiration)
-	n, err := tc.DecrementUint32("uint32", 2)
-	if err != nil {
-		t.Error("Error decrementing:", err)
-	}
-	if n != 3 {
-		t.Error("Returned number is not 3:", n)
-	}
-	x, found := tc.Get("uint32")
-	if !found {
-		t.Error("uint32 was not found")
-	}
-	if x.(uint32) != 3 {
-		t.Error("uint32 is not 3:", x)
-	}
-}
-
-func TestDecrementUint64(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("uint64", uint64(5), DefaultExpiration)
-	n, err := tc.DecrementUint64("uint64", 2)
-	if err != nil {
-		t.Error("Error decrementing:", err)
-	}
-	if n != 3 {
-		t.Error("Returned number is not 3:", n)
-	}
-	x, found := tc.Get("uint64")
-	if !found {
-		t.Error("uint64 was not found")
-	}
-	if x.(uint64) != 3 {
-		t.Error("uint64 is not 3:", x)
-	}
-}
-
-func TestDecrementFloat32(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("float32", float32(5), DefaultExpiration)
-	n, err := tc.DecrementFloat32("float32", 2)
-	if err != nil {
-		t.Error("Error decrementing:", err)
-	}
-	if n != 3 {
-		t.Error("Returned number is not 3:", n)
-	}
-	x, found := tc.Get("float32")
-	if !found {
-		t.Error("float32 was not found")
-	}
-	if x.(float32) != 3 {
-		t.Error("float32 is not 3:", x)
-	}
-}
-
-func TestDecrementFloat64(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("float64", float64(5), DefaultExpiration)
-	n, err := tc.DecrementFloat64("float64", 2)
-	if err != nil {
-		t.Error("Error decrementing:", err)
-	}
-	if n != 3 {
-		t.Error("Returned number is not 3:", n)
-	}
-	x, found := tc.Get("float64")
-	if !found {
-		t.Error("float64 was not found")
-	}
-	if x.(float64) != 3 {
-		t.Error("float64 is not 3:", x)
-	}
-}
-
 func TestAdd(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
+	tc := New[string, string](DefaultExpiration, 0)
 	err := tc.Add("foo", "bar", DefaultExpiration)
 	if err != nil {
 		t.Error("Couldn't add foo even though it shouldn't exist")
@@ -1125,7 +143,7 @@ func TestAdd(t *testing.T) {
 }
 
 func TestReplace(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
+	tc := New[string, string](DefaultExpiration, 0)
 	err := tc.Replace("foo", "bar", DefaultExpiration)
 	if err == nil {
 		t.Error("Replaced foo when it shouldn't exist")
@@ -1138,7 +156,7 @@ func TestReplace(t *testing.T) {
 }
 
 func TestDelete(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
+	tc := New[string, string](DefaultExpiration, 0)
 	tc.Set("foo", "bar", DefaultExpiration)
 	tc.Delete("foo")
 	x, found := tc.Get("foo")
@@ -1151,7 +169,7 @@ func TestDelete(t *testing.T) {
 }
 
 func TestItemCount(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
+	tc := New[string, string](DefaultExpiration, 0)
 	tc.Set("foo", "1", DefaultExpiration)
 	tc.Set("bar", "2", DefaultExpiration)
 	tc.Set("baz", "3", DefaultExpiration)
@@ -1161,7 +179,7 @@ func TestItemCount(t *testing.T) {
 }
 
 func TestFlush(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
+	tc := New[string, string](DefaultExpiration, 0)
 	tc.Set("foo", "bar", DefaultExpiration)
 	tc.Set("baz", "yes", DefaultExpiration)
 	tc.Flush()
@@ -1181,58 +199,15 @@ func TestFlush(t *testing.T) {
 	}
 }
 
-func TestIncrementOverflowInt(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("int8", int8(127), DefaultExpiration)
-	err := tc.Increment("int8", 1)
-	if err != nil {
-		t.Error("Error incrementing int8:", err)
-	}
-	x, _ := tc.Get("int8")
-	int8 := x.(int8)
-	if int8 != -128 {
-		t.Error("int8 did not overflow as expected; value:", int8)
-	}
-
-}
-
-func TestIncrementOverflowUint(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("uint8", uint8(255), DefaultExpiration)
-	err := tc.Increment("uint8", 1)
-	if err != nil {
-		t.Error("Error incrementing int8:", err)
-	}
-	x, _ := tc.Get("uint8")
-	uint8 := x.(uint8)
-	if uint8 != 0 {
-		t.Error("uint8 did not overflow as expected; value:", uint8)
-	}
-}
-
-func TestDecrementUnderflowUint(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
-	tc.Set("uint8", uint8(0), DefaultExpiration)
-	err := tc.Decrement("uint8", 1)
-	if err != nil {
-		t.Error("Error decrementing int8:", err)
-	}
-	x, _ := tc.Get("uint8")
-	uint8 := x.(uint8)
-	if uint8 != 255 {
-		t.Error("uint8 did not underflow as expected; value:", uint8)
-	}
-}
-
 func TestOnEvicted(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
+	tc := New[string, int](DefaultExpiration, 0)
 	tc.Set("foo", 3, DefaultExpiration)
 	if tc.onEvicted != nil {
 		t.Fatal("tc.onEvicted is not nil")
 	}
 	works := false
-	tc.OnEvicted(func(k string, v interface{}) {
-		if k == "foo" && v.(int) == 3 {
+	tc.OnEvicted(func(k string, v int) {
+		if k == "foo" && v == 3 {
 			works = true
 		}
 		tc.Set("bar", 4, DefaultExpiration)
@@ -1242,13 +217,13 @@ func TestOnEvicted(t *testing.T) {
 	if !works {
 		t.Error("works bool not true")
 	}
-	if x.(int) != 4 {
+	if *x != 4 {
 		t.Error("bar was not 4")
 	}
 }
 
 func TestCacheSerialization(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
+	tc := New[string, any](DefaultExpiration, 0)
 	testFillAndSerialize(t, tc)
 
 	// Check if gob.Register behaves properly even after multiple gob.Register
@@ -1256,7 +231,7 @@ func TestCacheSerialization(t *testing.T) {
 	testFillAndSerialize(t, tc)
 }
 
-func testFillAndSerialize(t *testing.T, tc *Cache) {
+func testFillAndSerialize(t *testing.T, tc *Cache[string, any]) {
 	tc.Set("a", "a", DefaultExpiration)
 	tc.Set("b", "b", DefaultExpiration)
 	tc.Set("c", "c", DefaultExpiration)
@@ -1267,14 +242,14 @@ func testFillAndSerialize(t *testing.T, tc *Cache) {
 		{Num: 3},
 	}, DefaultExpiration)
 	tc.Set("[]*struct", []*TestStruct{
-		&TestStruct{Num: 4},
-		&TestStruct{Num: 5},
+		{Num: 4},
+		{Num: 5},
 	}, DefaultExpiration)
 	tc.Set("structception", &TestStruct{
 		Num: 42,
 		Children: []*TestStruct{
-			&TestStruct{Num: 6174},
-			&TestStruct{Num: 4716},
+			{Num: 6174},
+			{Num: 4716},
 		},
 	}, DefaultExpiration)
 
@@ -1284,7 +259,7 @@ func testFillAndSerialize(t *testing.T, tc *Cache) {
 		t.Fatal("Couldn't save cache to fp:", err)
 	}
 
-	oc := New(DefaultExpiration, 0)
+	oc := New[string, any](DefaultExpiration, 0)
 	err = oc.Load(fp)
 	if err != nil {
 		t.Fatal("Couldn't load cache from fp:", err)
@@ -1294,7 +269,7 @@ func testFillAndSerialize(t *testing.T, tc *Cache) {
 	if !found {
 		t.Error("a was not found")
 	}
-	if a.(string) != "a" {
+	if (*a).(string) != "a" {
 		t.Error("a is not a")
 	}
 
@@ -1302,7 +277,7 @@ func testFillAndSerialize(t *testing.T, tc *Cache) {
 	if !found {
 		t.Error("b was not found")
 	}
-	if b.(string) != "b" {
+	if (*b).(string) != "b" {
 		t.Error("b is not b")
 	}
 
@@ -1310,7 +285,7 @@ func testFillAndSerialize(t *testing.T, tc *Cache) {
 	if !found {
 		t.Error("c was not found")
 	}
-	if c.(string) != "c" {
+	if (*c).(string) != "c" {
 		t.Error("c is not c")
 	}
 
@@ -1324,7 +299,7 @@ func testFillAndSerialize(t *testing.T, tc *Cache) {
 	if !found {
 		t.Error("*struct was not found")
 	}
-	if s1.(*TestStruct).Num != 1 {
+	if (*s1).(*TestStruct).Num != 1 {
 		t.Error("*struct.Num is not 1")
 	}
 
@@ -1332,7 +307,7 @@ func testFillAndSerialize(t *testing.T, tc *Cache) {
 	if !found {
 		t.Error("[]struct was not found")
 	}
-	s2r := s2.([]TestStruct)
+	s2r := (*s2).([]TestStruct)
 	if len(s2r) != 2 {
 		t.Error("Length of s2r is not 2")
 	}
@@ -1347,7 +322,7 @@ func testFillAndSerialize(t *testing.T, tc *Cache) {
 	if !found {
 		t.Error("[]*struct was not found")
 	}
-	s3r := s3.([]*TestStruct)
+	s3r := (*s3).([]*TestStruct)
 	if len(s3r) != 2 {
 		t.Error("Length of s3r is not 2")
 	}
@@ -1362,7 +337,7 @@ func testFillAndSerialize(t *testing.T, tc *Cache) {
 	if !found {
 		t.Error("structception was not found")
 	}
-	s4r := s4.(*TestStruct)
+	s4r := (*s4).(*TestStruct)
 	if len(s4r.Children) != 2 {
 		t.Error("Length of s4r.Children is not 2")
 	}
@@ -1375,7 +350,7 @@ func testFillAndSerialize(t *testing.T, tc *Cache) {
 }
 
 func TestFileSerialization(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
+	tc := New[string, string](DefaultExpiration, 0)
 	tc.Add("a", "a", DefaultExpiration)
 	tc.Add("b", "b", DefaultExpiration)
 	f, err := ioutil.TempFile("", "go-cache-cache.dat")
@@ -1386,7 +361,7 @@ func TestFileSerialization(t *testing.T) {
 	f.Close()
 	tc.SaveFile(fname)
 
-	oc := New(DefaultExpiration, 0)
+	oc := New[string, string](DefaultExpiration, 0)
 	oc.Add("a", "aa", 0) // this should not be overwritten
 	err = oc.LoadFile(fname)
 	if err != nil {
@@ -1396,7 +371,7 @@ func TestFileSerialization(t *testing.T) {
 	if !found {
 		t.Error("a was not found")
 	}
-	astr := a.(string)
+	astr := *a
 	if astr != "aa" {
 		if astr == "a" {
 			t.Error("a was overwritten")
@@ -1408,13 +383,13 @@ func TestFileSerialization(t *testing.T) {
 	if !found {
 		t.Error("b was not found")
 	}
-	if b.(string) != "b" {
+	if *b != "b" {
 		t.Error("b is not b")
 	}
 }
 
 func TestSerializeUnserializable(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
+	tc := New[string, any](DefaultExpiration, 0)
 	ch := make(chan bool, 1)
 	ch <- true
 	tc.Set("chan", ch, DefaultExpiration)
@@ -1435,7 +410,7 @@ func BenchmarkCacheGetNotExpiring(b *testing.B) {
 
 func benchmarkCacheGet(b *testing.B, exp time.Duration) {
 	b.StopTimer()
-	tc := New(exp, 0)
+	tc := New[string, string](exp, 0)
 	tc.Set("foo", "bar", DefaultExpiration)
 	b.StartTimer()
 	for i := 0; i < b.N; i++ {
@@ -1496,7 +471,7 @@ func BenchmarkCacheGetConcurrentNotExpiring(b *testing.B) {
 
 func benchmarkCacheGetConcurrent(b *testing.B, exp time.Duration) {
 	b.StopTimer()
-	tc := New(exp, 0)
+	tc := New[string, string](exp, 0)
 	tc.Set("foo", "bar", DefaultExpiration)
 	wg := new(sync.WaitGroup)
 	workers := runtime.NumCPU()
@@ -1552,7 +527,7 @@ func benchmarkCacheGetManyConcurrent(b *testing.B, exp time.Duration) {
 	// in sharded_test.go.
 	b.StopTimer()
 	n := 10000
-	tc := New(exp, 0)
+	tc := New[string, string](exp, 0)
 	keys := make([]string, n)
 	for i := 0; i < n; i++ {
 		k := "foo" + strconv.Itoa(i)
@@ -1584,7 +559,7 @@ func BenchmarkCacheSetNotExpiring(b *testing.B) {
 
 func benchmarkCacheSet(b *testing.B, exp time.Duration) {
 	b.StopTimer()
-	tc := New(exp, 0)
+	tc := New[string, string](exp, 0)
 	b.StartTimer()
 	for i := 0; i < b.N; i++ {
 		tc.Set("foo", "bar", DefaultExpiration)
@@ -1605,7 +580,7 @@ func BenchmarkRWMutexMapSet(b *testing.B) {
 
 func BenchmarkCacheSetDelete(b *testing.B) {
 	b.StopTimer()
-	tc := New(DefaultExpiration, 0)
+	tc := New[string, string](DefaultExpiration, 0)
 	b.StartTimer()
 	for i := 0; i < b.N; i++ {
 		tc.Set("foo", "bar", DefaultExpiration)
@@ -1630,7 +605,7 @@ func BenchmarkRWMutexMapSetDelete(b *testing.B) {
 
 func BenchmarkCacheSetDeleteSingleLock(b *testing.B) {
 	b.StopTimer()
-	tc := New(DefaultExpiration, 0)
+	tc := New[string, string](DefaultExpiration, 0)
 	b.StartTimer()
 	for i := 0; i < b.N; i++ {
 		tc.mu.Lock()
@@ -1653,19 +628,9 @@ func BenchmarkRWMutexMapSetDeleteSingleLock(b *testing.B) {
 	}
 }
 
-func BenchmarkIncrementInt(b *testing.B) {
-	b.StopTimer()
-	tc := New(DefaultExpiration, 0)
-	tc.Set("foo", 0, DefaultExpiration)
-	b.StartTimer()
-	for i := 0; i < b.N; i++ {
-		tc.IncrementInt("foo", 1)
-	}
-}
-
 func BenchmarkDeleteExpiredLoop(b *testing.B) {
 	b.StopTimer()
-	tc := New(5*time.Minute, 0)
+	tc := New[string, string](5*time.Minute, 0)
 	tc.mu.Lock()
 	for i := 0; i < 100000; i++ {
 		tc.set(strconv.Itoa(i), "bar", DefaultExpiration)
@@ -1678,7 +643,7 @@ func BenchmarkDeleteExpiredLoop(b *testing.B) {
 }
 
 func TestGetWithExpiration(t *testing.T) {
-	tc := New(DefaultExpiration, 0)
+	tc := New[string, any](DefaultExpiration, 0)
 
 	a, expiration, found := tc.GetWithExpiration("a")
 	if found || a != nil || !expiration.IsZero() {
@@ -1707,7 +672,7 @@ func TestGetWithExpiration(t *testing.T) {
 	}
 	if x == nil {
 		t.Error("x for a is nil")
-	} else if a2 := x.(int); a2+2 != 3 {
+	} else if a2 := (*x).(int); a2+2 != 3 {
 		t.Error("a2 (which should be 1) plus 2 does not equal 3; value:", a2)
 	}
 	if !expiration.IsZero() {
@@ -1720,7 +685,7 @@ func TestGetWithExpiration(t *testing.T) {
 	}
 	if x == nil {
 		t.Error("x for b is nil")
-	} else if b2 := x.(string); b2+"B" != "bB" {
+	} else if b2 := (*x).(string); b2+"B" != "bB" {
 		t.Error("b2 (which should be b) plus B does not equal bB; value:", b2)
 	}
 	if !expiration.IsZero() {
@@ -1733,7 +698,7 @@ func TestGetWithExpiration(t *testing.T) {
 	}
 	if x == nil {
 		t.Error("x for c is nil")
-	} else if c2 := x.(float64); c2+1.2 != 4.7 {
+	} else if c2 := (*x).(float64); c2+1.2 != 4.7 {
 		t.Error("c2 (which should be 3.5) plus 1.2 does not equal 4.7; value:", c2)
 	}
 	if !expiration.IsZero() {
@@ -1746,7 +711,7 @@ func TestGetWithExpiration(t *testing.T) {
 	}
 	if x == nil {
 		t.Error("x for d is nil")
-	} else if d2 := x.(int); d2+2 != 3 {
+	} else if d2 := (*x).(int); d2+2 != 3 {
 		t.Error("d (which should be 1) plus 2 does not equal 3; value:", d2)
 	}
 	if !expiration.IsZero() {
@@ -1759,7 +724,7 @@ func TestGetWithExpiration(t *testing.T) {
 	}
 	if x == nil {
 		t.Error("x for e is nil")
-	} else if e2 := x.(int); e2+2 != 3 {
+	} else if e2 := (*x).(int); e2+2 != 3 {
 		t.Error("e (which should be 1) plus 2 does not equal 3; value:", e2)
 	}
 	if expiration.UnixNano() != tc.items["e"].Expiration {