Remove lots of as
casts with modern alternatives:
#34
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a as *mut T
=>a.cast()
a.offset(b as isize)
=>a.add(b)
a.offset(-(b as isize))
=>a.sub(b)
u32 as usize
=>usize::try_from(_).unwrap()
In general
as
has the potential of losing bits so try to avoid it where we can.