What types should be accepted as bytes path?
For now os.path is strict and accepts only bytes and bytes subclasses
(even bytearray is not accepted) as bytes path. This is enough for
working with low-level Posix paths and supporting backward compatibility.
On other hand, most os functions is too permissive since 3.3 and accept
any type that supports the buffer protocol as bytes path. Accepted even
such meaningless objects as array('h').
Some functions (zipimport.zipimporter() in 3.x, _imp.load_dynamic() in
3.3+, builtin compile() etc in 3.4) accept even arbitrary iterables,
e.g. [116, 101, 115, 116] (see http://bugs.python.org/issue26754).
I think we should accept only bytes (and subclasses). Even bytearray is
less acceptable since it is mutable and can't be used as a key in caches.
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