[issue36593] Trace function interferes with MagicMock isinstance?

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan <tir.karthi at gmail.com>:


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stage:  -> patch review
type:  -> behavior

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36593>
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