[issue6210] Exception Chaining missing method for suppressing context

[Ethan Furman]

Ethan Furman <ethan at stoneleaf.us> added the comment:

Patrick: The value in this enhancement is in not displaying the chained exception.  I do not see any value in throwing it away completely.  If you don't care about __context__ you can safely ignore it.  On the other hand, if it is completely removed, and you do care about it... well, too bad.

Georg, Nick:  On further thought, I agree that having 'from None' set cause from None to True is counter-intuitive, and there is consistency in having __context__ as None and __cause__ as False.

Thanks, Nick, for the pointers on the necessary changes.

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