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set_unset & friends for `ActiveValue` (#3083)

* set_unset & friends

* cargo fmt

* change set_unset to set_if_unset

* Simplify set_if_unset* to if-let, drop dead match arm

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Co-authored-by: Chris Tsang <chris.2y3@outlook.com>
I
Izzy McCabe committed
205ebce66105ddd44eb16d2c2594dd3554478ee8
Parent: f16936d
Committed by GitHub <noreply@github.com> on 8/1/2026, 7:15:02 PM