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Use volatile read in steal #14
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Since
stealreads from memory that might be concurrently modified, it's better to useptr::read_volatilethanptr::read.A similar situation in
seqlock: https://github.com/Amanieu/seqlock/blob/bccfed2f6638aeb86c1e3794d285f82153c4e487/src/lib.rs#L147See also: rust-lang/rust#52391