If I type log10(-1), I get a complex number back whose real part is the
log of the absolute value of the argument, and whose imaginary part is
always equal to 1.36438. What's more, I get similar behavior with a
natural log, but the imaginary part is always equal to Pi.
I've managed to confirm that this behavior is compatible with ML, so I
imagine it's not a bug, but can someone explain to me the logic here?
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