add an api that actually allows passing mutable strings into sajson
add an api that actually allows passing mutable strings into sajson

chadaustin/sajson,t089/sajson,chadaustin/sajson,iboB/sajson,iboB/sajson,t089/sajson,iboB/sajson,t089/sajson,iboB/sajson,iboB/sajson,t089/sajson,chadaustin/sajson,chadaustin/sajson,chadaustin/sajson,t089/sajson,iboB/sajson,chadaustin/sajson