[issue34706] Signature.from_callable sometimes drops subclassing

[Buck Evan]

New submission from Buck Evan <buck.2019 at gmail.com>:

Specifically in the case of a class that does not override its constructor signature inherited from object.

Github PR incoming shortly.

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components: Library (Lib)
messages: 325501
nosy: bukzor
priority: normal
severity: normal
status: open
title: Signature.from_callable sometimes drops subclassing
versions: Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34706>
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