> #lang typed/racket
> 
> (define-type MaybePB (U Positive-Byte False))
> 
> (: f ( [Listof MaybePB] -> [Listof Positive-Byte]))
> (define (f x)
>   ((inst filter MaybePB Positive-Byte) number? x))
> 
> (f '(1 #false))

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