[issue24641] Log type of unserializable value when raising JSON TypeError

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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keywords: +patch
pull_requests: +4317
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue24641>
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