func (c *Client) Flush() {
	if c.muted {
		return
	}
	c.conn.mu.Lock()
	c.conn.flush(0)
	c.conn.mu.Unlock()
}
func (c *Client) Flush() {
	if c.muted {
		return
	}
	c.conn.mu.Lock()
	c.conn.flush(0)
	c.conn.mu.Unlock()
}
// Flush flushes the Client's buffer.