Commits on Apr 15, 2022

1. Make some usize-typed masks definition agnostic to the size of usize …

   Some masks where defined as
   ```rust
   const NONASCII_MASK: usize = 0x80808080_80808080u64 as usize;
   ```
   where it was assumed that `usize` is never wider than 64, which is currently true.
   
   To make those constants valid in a hypothetical 128-bit target, these constants have been redefined in an `usize`-width-agnostic way
   ```rust
   const NONASCII_MASK: usize = usize::from_ne_bytes([0x80; size_of::<usize>()]);
   ```
   
   There are already some cases where Rust anticipates the possibility of supporting 128-bit targets, such as not implementing `From<usize>` for `u64`.

   

   eduardosm committed Apr 15, 2022
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