make the internal stack api opaque
make the internal stack api opaque

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