You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: type_specific_codegen.go
    path of file: ./repos/RxGo/vendor/github.com/stretchr/objx
    
    the code of the file until where you have to start completion: package objx

/*
   Inter (interface{} and []interface{})
*/

// Inter gets the value as a interface{}, returns the optionalDefault
// value or a system default object if the value is the wrong type.
func (v *Value) Inter(optionalDefault ...interface{}) inte
    
func (v *Value) GroupStr(grouper func(int, string) string) *Value {
	groups := make(map[string][]string)
	v.EachStr(func(index int, val string) bool {
		group := grouper(index, val)
		if _, ok := groups[group]; !ok {
			groups[group] = make([]string, 0)
		}
		groups[group] = append(groups[group], val)
		return true
	})
	return &Value{data: groups}
}