func IsKeyNotFound(err error) bool {
	if cErr, ok := err.(Error); ok {
		return cErr.Code == ErrorCodeKeyNotFound
	}
	return false
}
func IsKeyNotFound(err error) bool {
	if cErr, ok := err.(Error); ok {
		return cErr.Code == ErrorCodeKeyNotFound
	}
	return false
}
func IsKeyNotFound ( err error ) bool { if cErr , ok := err . ( Error ) ; ok { return cErr . Code == ErrorCodeKeyNotFound } return false }
// IsKeyNotFound returns true if the error code is ErrorCodeKeyNotFound.
IsKeyNotFound returns true if the error code is ErrorCodeKeyNotFound .