Buggy or strange behaviour matching mutable data with `re`

Bug report

Bug description:

import re
data = bytearray(b'1')
match = re.match(b'1', data)
print(match[0])  # b'1'
data[:] = b'2'
print(match[0])  # b'2'

If you match against mutable data (e.g., a bytearray) and change that data after matching, the matched values reported by the match change.

Is this a) a bug or b) strange behavior that should be pointed out in the docs (or c) none of the above)?

CPython versions tested on:

3.13

Operating systems tested on:

Linux

首先，使用可变的 bytearray 运行提供的 Python 3.13 reproducer，并检查变更后产生的匹配值。阅读相关的 re 行为和现有测试覆盖，以确定这是实现错误还是已有文档说明的行为。只有在该行为得到明确解决，并具有相应的回归测试覆盖或文档时，才算完成。