JuliaLang / julia / #38042

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local

Committed by web-flow

Commit Message

fix `nextpow`, `prevpow` for types without `typemax` (#49669)

Without this change `prevpow` and `nextpow` fail for, e.g., `BigInt`;
incorrectly throwing a `MethodError`. For example, calls like
`prevpow(3, big"10")` or `nextpow(3, big"10")` fail.

The issue is that the code incorrectly assumes the existence of a
`typemax` method.

Another issue was a missing promote for the arguments of a
`mul_with_overflow` call.

Fixes #57906

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