code: func (c *Cookie) CopyTo(src *Cookie) {
  	c.Reset()
  	c.key = append(c.key[:0], src.key...)
  	c.value = append(c.value[:0], src.value...)
  	c.expire = src.expire
  	c.maxAge = src.maxAge
  	c.domain = append(c.domain[:0], src.domain...)
  	c.path = append(c.path[:0], src.path...)
  	c.httpOnly = src.httpOnly
  	c.secure = src.secure
  	c.sameSite = src.sameSite
  }
docs: // CopyTo copies src cookie to c.