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04bcb393ab
Improved assumptions relating to isqrt Improved various assumptions relating to values yielded by `isqrt`. Does not solve but does improve rust-lang/rust#132763. Re-openeing of rust-lang/rust#154115 Added assumptions are: * if `x` is nonzero then `x.isqrt()` is nonzero * `x.isqrt() <= x` * `x.isqrt() * x.isqrt() <= x`