Fix comparison bug exposed in python 3
Fix comparison bug exposed in python 3

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