[issue24145] Support |= for parameters in converters

[Nick Coghlan]

Nick Coghlan added the comment:

Aye, it occurs to me now that introducing the implicit form trades a "write
time" lookup (where you have to override the converter defaults
explicitly), for a "read time" lookup (where you need to mentally add the
defaults to understand the modified accept clause)

As a result, I think "explicit is better than implicit" wins, at least for
now. If we decide after we have more experience that the repetition of the
defaults when overriding them really is a problem, then it's possible to
revisit that decision in the 3.6 time frame.

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<http://bugs.python.org/issue24145>
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