More efficient conversion in ^(::Complex, ::Complex) #17259
Merged
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This can avoid a costly allocation of e.g. BigInt(2).
Cf. https://github.com/JuliaLang/julia/pull/16995/files/f3eabc3abaae1a8c9d558e31467cbfeffaa5319e..732828ce8ec3d0519a0953338cc02f13312dfec9#r69392763.