Another strange question, this time to do with extended precision numbers.
Have you ever wanted good performance out of a large array of extended-precision integers (or, for that matter, rationals), where most of the integers involved would not have fit in a machine integer (magnitude approx. 2^63)?
(I recognise that this is probably not an ideal place to ask, given that j's extended integers have not historically been even remotely performant. But most things that aren't j have poor support for arrays, sooo~)
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