[Python-ideas] Decorator to avoid a mistake

[Vince Vinet]

Hello,

While I think this should not be "on by default", I don't see the harm in
being able to opt-in to this behavior.

I also figured spending a few minutes attempting to write this would be fun:

https://gist.github.com/veloutin/2ec3e5246651f5de78442516d8e24fc1

François: sorry about the double reply, I forgot to reply to the list.

Vince
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