strip/lstrip/rstrip don't work like I thought
strip/lstrip/rstrip don't work like I thought

`"foobar".rstrip("rab")` returns "foo".

murrown/cyder,OSU-Net/cyder,drkitty/cyder,OSU-Net/cyder,murrown/cyder,akeym/cyder,zeeman/cyder,drkitty/cyder,drkitty/cyder,zeeman/cyder,murrown/cyder,zeeman/cyder,akeym/cyder,akeym/cyder,murrown/cyder,akeym/cyder,OSU-Net/cyder,drkitty/cyder,OSU-Net/cyder,zeeman/cyder