code: func (c *Container) Contains(v uint16) bool {
  	if c.isArray() {
  		return c.arrayContains(v)
  	} else if c.isRun() {
  		return c.runContains(v)
  	} else {
  		return c.bitmapContains(v)
  	}
  }
docs: // Contains returns true if v is in the container.