function isBigInt(obj) {
    if (!obj || typeof obj !== 'object' || !bigIntValueOf) {
        return false;
    }
    try {
        bigIntValueOf.call(obj);
        return true;
    } catch (e) {}
    return false;
}
Create an attachment Content-Disposition header.

@param {string} [filename]
@param {object} [options]
@param {string} [options.type=attachment]
@param {string|boolean} [options.fallback=true]
@return {string}
@public