[issue17911] traceback: add a new thin class storing a traceback without storing local variables

[Antoine Pitrou]

Antoine Pitrou added the comment:

You can also switch back to a single constructor, taking either an
exception instance or an exception triple. That way everyone is happy -
except perhaps if you are ideologically opposed to polymorphic
signatures :-)

Switching to python-dev would probably be overkill for this.

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<http://bugs.python.org/issue17911>
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