[feature idea] Allow duplicate files with the same content

[Nikolai Lifanov]

On 7/24/17 6:12 PM, Yuri wrote:
> Currently several py-backports-* ports install the same __init__.py file
> into the same location. This is the only conflict between several ports.
> This was by design, because they didn't think it matters to overwrite
> the same file installed by another package. [1]
> 

The content of these is the same functionally but not textually.
The comments, spacing, single line versus three lines, etc. is
different. It's the same python code, but it won't hash to the same thing.

- Nikolai

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