[issue22547] Implement an informative `BoundArguments.__repr__`

[Terry J. Reedy]

Terry J. Reedy added the comment:

.arguments returns a mutable (ordered) dict that can be modified.  See the example in the doc
https://docs.python.org/3.4/library/inspect.html#inspect.BoundArguments

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<http://bugs.python.org/issue22547>
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