> Yes, this is a more universal problem in the UI:

I object. It is a *very* simple mistake that has a *very* simple solution:

    Any function that takes **kwargs as argument must:
        1) Remove from kwargs all values it understands
        2) Forward the remaining content of kwargs to a subfunction

There is no way on earth that stuff will get lost if you use this very
simple logic. Any additional keyword will raise an exception
eventually.

> It would be nice if we can find an easy to use, low (zero?) overhead way of
> getting better checking on unknown keywords. I don't have a solution (python
> definitely seems to invite the lax way we're doing it)

I propose the pattern above, which was used successfully to make the
graph plot routines somewhat trustworthy (at least from this point of
view).

Nathann

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