[issue20104] expose posix_spawn(p)

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

I propose the following changes to the file_actions parameter in PR 6725. Currently it is the fourth positional-only parameter with the default value None.

1. Change its default value to an empty tuple. None will no longer be accepted as a special case. This will simplify a mental model.

2. Since the order of parameters already doesn't math the natural order of the corresponding C function, and many other keyword-only parameters will be added in PR 6693, it makes sense to make file_actions a keyword-only parameter too.

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