add NonZeroU16 -> NonZeroUsize and NonZeroI16 -> NonZeroIsize
add NonZeroU16 -> NonZeroUsize and NonZeroI16 -> NonZeroIsize

aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust