[issue17445] Return the type you accept

[Greg Ward]

Greg Ward added the comment:

OK I now have two competing patches. Both are disgusting, but in different ways.

1) http://hg.gerg.ca/cpython/rev/fcf3d27f20d9
   - factor out all the string constants
   - always concatenate, do not .format()

2) http://hg.gerg.ca/cpython/rev/cebefce2cfd4
   - copy {unified,context}_diff() to {unified,context}_diff_bytes()
   - this is a future maintenance headache, guaranteed!

Feedback welcome. If anyone can see a way to unify these two approaches, or a third way that sucks less, I'm all ears.

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hgrepos: +179

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