[3.14 regression] Cannot copy Union containing objects that do not implement `__or__`

[JelleZijlstra]

Bug report

Bug description:

In 3.13 it was possible to copy a Union containing any object:

>>> copy.copy(typing.Union[b"x", b"y"])
typing.Union[b'x', b'y']

But in main this fails:

>>> copy.copy(typing.Union[b"x", b"y"])
Traceback (most recent call last):
  File "<python-input-2>", line 1, in <module>
    copy.copy(typing.Union[b"x", b"y"])
    ~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/jelle/py/cpython/Lib/copy.py", line 100, in copy
    return _reconstruct(x, None, *rv)
  File "/Users/jelle/py/cpython/Lib/copy.py", line 234, in _reconstruct
    y = func(*args)
TypeError: unsupported operand type(s) for |: 'bytes' and 'bytes'
>>> 

This doesn't affect any types supported by the type system (all of which support |), but may affect users who put non-standard objects inside a Union.

CPython versions tested on:

CPython main branch

Operating systems tested on:

macOS

Linked PRs

• gh-132882: Fix copying of unions with members that do not support __or__ #132883