It seems that there is one thing missing in String - one of Insert flavour, that is:
void Insert(int pos, const char *s, int count).
Hmm - has no one ever used this func . Maybe i am wrong about this - maybe this was fixed, although when i used it - it didn't compiled correctly - i think count and s were reversed. Just to check..

This compiled on one not so old revision, meaning one wrote code that was meant in one way but compiled ok in wrong way.

WString has this: void Insert(int pos, const wchar *s, int count), it seems String does not.

CONSOLE_APP_MAIN
{
	String x = "1234";
	x.Insert(1, "ABCD", 2);
	DDUMP(x);
}