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Unfortunately, I think

> Grab the text from the
> underlying TypeError and append it to the higher level
> message before re-raising TypeError.

might be a bit of a bear to implement.  If I'm being dumb
about this, feel free to apply the cluestick (bearing in
mind that in general stringifying the TypeError may execute
Python code).

There probably is no ideal solution to this -- it's a knotty
problem.  The problem with current CVS is that it can lose
information, whereas before it failed to add it...