[erlang-questions] crypto:mod_exp/3 returns wrong result?

[moi]

I think the problem with crypto here is if it could not handle negative
numbers properly, it should not handle it at all.

crypto:mpint/1 is trying to use complement numbers to represent negatives.
> crypto:mpint(-1).
<<0,0,0,1,255>>
> crypto:mod_exp(-2, 3, -3) == crypto:mod_exp(254, 3, 253).
true

PS, Will Erlang be a possible choice for scientific computation? Like SciPy.

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