Hi Armin,


> As you have noticed, this is an old feature not supported any more
> since a long time (and mostly untested).  It was an experimental
> feature that turned out not to be useful in practice.  Just using
> regular Python, you can mostly achieve the same effects, with the
> exception (mostly) of pretending to have an object of some built-in
> type for built-in function calls.
>

actually, ​jinja2​ uses transparent proxy to create fictiious traceback
chains:
https://github.com/mitsuhiko/jinja2/blob/master/jinja2/debug.py

​if we decided that transparent proxies are not supported or deprecated, we
should remove them and tell people to stop using them.​
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