[issue36774] f-strings: Add a !d conversion for ease of debugging

[Eric V. Smith]

Eric V. Smith <eric at trueblade.com> added the comment:

!= would be my preference, but it can't work. f'{0!=1}' is already legal.

I'm not crazy about !!. I think that will be too confusing.

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<https://bugs.python.org/issue36774>
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