[issue9873] Allow bytes in some APIs that use string literals internally

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

Yeah, the general implementation concept I'm thinking of going with for option 2 will use a few helper functions:

url, coerced_to_str = _coerce_to_str(url)
if coerced_to_str:
    param = _force_to_str(param) # as appropriate
...
return _undo_coercion(result, coerced_to_str)

The first helper function standardises the typecheck, the second one complains if it is given something that is already a string.

The last one just standardises the check to see if the coercion needs to be undone, and actually undoing the coercion.

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<http://bugs.python.org/issue9873>
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