feat: add Clone method.

Author: ghosind

optional.go

@@ -31,6 +31,13 @@ func Empty[T comparable]() *Optional[T] {
 	return opt
 }
 
+// Clone creates and returns a copy of this optional value.
+func (opt *Optional[T]) Clone() *Optional[T] {
+	clone := new(Optional[T])
+	clone.val = opt.val
+	return clone
+}
+
 // Equals indicates whether some other value is equals to this Optional.
 func (opt *Optional[T]) Equals(other any) bool {
 	if opt == other {

optional_test.go

@@ -100,6 +100,20 @@ func TestOptional(t *testing.T) {
 	a.EqualNow(opt.OrElse("default"), "some text")
 }
 
+func TestOptionalClone(t *testing.T) {
+	a := assert.New(t)
+
+	opt := optional.Empty[string]()
+	cpy := opt.Clone()
+	a.NotEqualNow(opt, cpy)
+	a.EqualNow(cpy.IsEmpty(), cpy.IsEmpty())
+
+	opt = optional.Of("test")
+	cpy = opt.Clone()
+	a.NotEqualNow(opt, cpy)
+	a.EqualNow(cpy.GetPanic(), opt.GetPanic())
+}
+
 func TestOptionalEquals(t *testing.T) {
 	a := assert.New(t)