don't throw DomainError for negative integer powers of ±1 #18342
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…18342) * don't throw DomainError for negative integer powers of ±1 * fix replutil test that was expecting 1^(-1) to fail
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As discussed in #3024, #12822, we throw a
DomainErrorfor e.g.2^-2. However, we shouldn't throw an error for1^-2or(-1)^-2, since the result is an integer.