subprocess._USE_VFORK escape hatch broken, fix or remove?

Off the top of my head (which is full… so does that mean much?) – I’m not aware of anyone actually using the escape hatch.

We had concerns that someone may need it during the initial implementation, but does anyone have references to people or projects that found a practical need and are willing to share those publicly?

if it isn’t behaving right, that’s a sign that we aren’t really testing it reliably…

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