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Find the mean of squared deviation of bigints from its mean.
Similar: mean, median, modes, variance, range.
function variance(...xs) // xs: a list of bigints
const xbigint = require('extra-bigint'); xbigint.variance(1n, 2n); // → 0n xbigint.variance(1n, 2n, 3n); // → 0n xbigint.variance(1n, 2n, 3n, 4n); // → 1n