Minor cleanups in transformation code
Minor cleanups in transformation code

jml/pyrsistent,jkbjh/pyrsistent,Futrell/pyrsistent,tobgu/pyrsistent,tobgu/pyrsistent,jml/pyrsistent,Futrell/pyrsistent,tobgu/pyrsistent,Futrell/pyrsistent,jkbjh/pyrsistent,jml/pyrsistent,jkbjh/pyrsistent