func (mm *FastIntIntMap) MkString4(before, between, after, equals string) string {
	if mm == nil {
		return ""
	}
	return mm.mkString4Bytes(before, between, after, equals).String()
}
// MkString4 concatenates the map key/values as a string, using the prefix, separator and suffix supplied.
MkString4 concatenates the map key/values as a string, using the prefix, separator and suffix supplied.
// MkString4 concatenates the map key / values as a string using the prefix separator and suffix supplied .
func (mm *FastIntIntMap) MkString4(before, between, after, equals string) string {
	if mm == nil {
		return ""
	}
	return mm.mkString4Bytes(before, between, after, equals).String()
}
func ( mm * FastIntIntMap ) MkString4 ( before , between , after , equals string ) string { if mm == nil { return " " } return mm . mkString4Bytes ( before , between , after , equals ) . String ( ) }
MkString4 concatenates the map key/values as a string, using the prefix, separator and suffix supplied.
MkString4 concatenates the map key / values as a string using the prefix separator and suffix supplied .