gingerBill 3f935bea25 union #shared_nil ...

This adds a feature to `union` which requires all the variants to have a `nil` value and on assign to the union, checks whether that value is `nil` or not. If the value is `nil`, the union will be `nil` (thus sharing the `nil` value)

2022-03-24 11:55:03 +00:00

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