[issue36865] FileInput does not allow 'rt' mode, but all its existing delegates do

[Nathaniel Gaertner]

Change by Nathaniel Gaertner <natgaertner at gmail.com>:


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keywords: +patch
pull_requests: +13131
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36865>
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