I would just type the param as Readonly<Date[]>. The function can still receive a mutable array (although the array should perhaps just be readonly to begin with).

I have a hard time imagining a use for asNever that I couldn't refactor into something more conventional.

Markle line went up and sold out instantaneously .....such a transparent ploy yet people fall for it. #Bots #ScarcityMarketing #AsNever #ThereWasNeverAnyProduct