[Python-ideas] Delegating `BoundArguments.__getitem__` to `BoundArguments.arguments.__getitem__`

[Ram Rachum]

Hi,

I suggest delegating `BoundArguments.__getitem__` to
`BoundArguments.arguments.__getitem__`, so instead of doing
`bound_arguments.arguments['foo']` we could do `bound_arguments['foo']`.
Since there isn't that much more to a `BoundArguments` object than its
arguments I think it's nice to save some typing and be able to access the
arguments directly.


Thanks,
Ram.
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