[issue39110] UserList-subclass Tree slicing changes the original list unexpectedly

[Tarn Yeong Ching]

Tarn Yeong Ching <i at ctarn.io> added the comment:

and more... It doesn't happen when Tree directly subclasses list.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39110>
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