add seq(), which is just itself and nil for empty list
seq() uses PersistentVectorSeq, which is based on ArraySeq
this is based on ArraySeq, and is need for vector seq()
load PersistentVectorSeq
start doing some vector seq testing
eliminate variable set / gen cloning and use pointers to the original 'parent' insn, also work on standard vector compilation
eliminate variable set / get cloning and use pointers to the original 'parent' insn, also work on standard vector compilation
disable tests for now