Function arrayPosition

arrayPosition<T extends Any<unknown, number>>(
    a0: Array<0 | 1, T>,
    a1: T,
): Int4<0 | 1>

arrayPosition<T extends Any<unknown, number>>(
    a0: Array<0 | 1, T>,
    a1: T,
    a2: undefined | number | Int4<0 | 1>,
): Int4<0 | 1>