Passing `bytes` to `pwd.getpwnam()` raises `TypeError` on CPython
pwd.getpwnam() function looks up a user record by username, or raises
KeyError . The username is supposed to be a
str, and CPython raises
TypeError if you pass another type, like
bytes. PyPy 3.6 and 3.7 raise
KeyError in this case. Additionally, PyPy's exception message doesn't use
repr() on the key, so the type issue isn't apparent in the traceback:
builtins.KeyError: 'getpwnam(): name not found: i-am-bytes'
PyPy should check the type to match CPython's behavior. Raising
KeyError is a Python 2 porting hazard, since the caller will usually catch that exception and treat it as if the user record is not present.
Discovered on this Twisted PR. See this failure of this test.
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