**`parse()` - Parse a UUID into its component bytes**
function parse(s, buf, offset) {
    var i = (buf && offset) || 0, ii = 0;

    buf = buf || [];
    s.toLowerCase().replace(/[0-9a-f]{2}/g, function(oct) {
        if (ii < 16) { // Don't overflow!
            buf[i + ii++] = _hexToByte[oct];
        }
    });

    // Zero out remaining bytes if string was short
    while (ii < 16) {
        buf[i + ii++] = 0;
    }

    return buf;
}