Hi, Apologies if es-discuss is the wrong venue for this; I've tried first poring through the specs and asking online to no avail.
My question is: why is the limit for the `maximumSignificantDigits` option in the `NumberFormat` API set at 21? This seems rather arbitrary — and especially odd to me given that, iiuc, all Numbers in JS, as 64 bit floats, can only encode up to 17 significant decimal digits. Is this some sort of weird historical artifact of something? Should the rationale be documented anywhere? Thanks! Ethan
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