[issue36819] Crash during encoding using UTF-16/32 and custom error handler

[Serhiy Storchaka]

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


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pull_requests: +26973
pull_request: https://github.com/python/cpython/pull/28593

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36819>
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