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Check if value is a bigint.
function is(x) // x: a value
const xbigint = require('extra-bigint'); xbigint.is(314n); // → true xbigint.is(-707n); // → true xbigint.is("314n"); // → false xbigint.is({"value": 314n}); // → false xbigint.is(null); // → false