py3: use pycompat.fsdecode() to pass to imp.* functions When we try to pass a bytes argument to a function from imp library, it returns TypeError as it deals with unicodes internally. So we can't use bytes with imp.* functions. Hunting through this, I found we were returning bytes path variable to loadpath() on Python 3.5 (yes most of our codebase is dealing with bytes on Python 3 especially the path variables). Passing unicode does not fails the purpose of loding the extensions and a module object is returned.