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4 years ago
"use strict";
var log = Math.log, sqrt = Math.sqrt;
module.exports = function (value) {
if (isNaN(value)) return NaN;
value = Number(value);
if (value === 0) return value;
if (!isFinite(value)) return value;
if (value < 0) {
value = -value;
return -log(value + sqrt(value * value + 1));
}
return log(value + sqrt(value * value + 1));
};