public boolean containsKey(final Object key) {
        final Entry<K, V>[] tbl = mapTable;
        if (key != null) {
            final int hashCode = key.hashCode();
            final int index = (hashCode & 0x7FFFFFFF) % tbl.length;
            for (Entry<K, V> e = tbl[index]; e != null; e = e.next) {
                if (e.hashCode == hashCode && key.equals(e.key)) {
                    return true;
                }
            }

      throw IOException("FRAME_SIZE_ERROR: $length")
    }
    val type = source.readByte() and 0xff
    val flags = source.readByte() and 0xff
    val streamId = source.readInt() and 0x7fffffff // Ignore reserved bit.
    if (type != TYPE_WINDOW_UPDATE && logger.isLoggable(FINE)) {
      logger.fine(frameLog(true, streamId, length, type, flags))
    }

    if (requireSettings && type != TYPE_SETTINGS) {

	MOV	$4096, X5							// b7120000
	MOV	$0x7ffff000, X5		// MOV	$2147479552, X5			// b7f2ff7f
	MOV	$-0x7ffff000, X5	// MOV	$-2147479552, X5		// b7120080
	MOV	$0x7fffffff, X5		// MOV	$2147483647, X5			// b70200809b82f2ff
	MOV	$-0x7fffffff, X5	// MOV	$-2147483647, X5		// b70200809b821200

	// Converted to load and shift(s)
	MOV	$0xffffffff, X5		// MOV	$4294967295, X5			// 9302f0ff93d20202

	AND	$0xff00ffff, R1                     // AND	$4278255615, R1                 // fbff9fd21be0bff221001b8a
	ANDS	$0xffff, R2                         // ANDS	$65535, R2                      // 423c40f2
	AND	$0x7fffffff, R3                     // AND	$2147483647, R3                 // 63784092
	ANDS	$0x0ffffffff80000000, R2            // ANDS	$-2147483648, R2                // 428061f2