RobinTail / express-zod-api / 14857137745 / 3

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Pull #2546

github

Optionals: Restore `undefined`, but depending on `optionality` (#2607)

Partially reverts 773b212f5 from #2604 
But this implementation does it depending on `optionality` which in its
turn depends on direction.
This takes Collin explanaition into account
https://x.com/colinhacks/status/1919292504861491252
And adds env test to ensure that.

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