INPUT
	TYPE	Any

OUTPUT
	TYPE	Any
	DESC	Append ',' (in term of bsdconv-keyword)

ARGUMENT
	AFTER
		TYPE	Hex Value List
	BEFORE
		TYPE	Hex Value List

EXAMPLE:
	printf test|bsdconv utf-8:insert#after=002c:bsdconv-keyword,utf-8
	t,e,s,t,
