Note on unions: [...new Set(a1, a2))] works for same type, failed with [1], ['x'], updated to use concat instead.
[...new Set(a1, a2))]
[1], ['x']
concat
Use Set only to dedupe, use Array for manipulation.
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Note on unions:
[...new Set(a1, a2))]works for same type, failed with[1], ['x'], updated to useconcatinstead.Use Set only to dedupe, use Array for manipulation.