Pandas QST: Global future flag

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I remember talking about it during the last contributor meeting, but have unfortunately forgotten the specifics.

I know there is currently a 'future_stack' flag for future features to be activated in the future for the stack function. During the discussion, there was a consensus to use a global flag instead of function-specific variables to implement new functionalities to existing functions that would warrant a deprecation warning first.

Is that implemented yet? I can't seem to find anything currently in the code but could've sworn we talked about one existing.

Comment From: rhshadrach

The decision was to implement a global flag on a per-change basis, not a single global flag. Here are some examples:

https://github.com/pandas-dev/pandas/blob/bd9f060999c282907861a3f077513eef7f374579/pandas/core/config_init.py#L880-L899

Closing for now. Just comment here if you have any follow up questions.