protected function set_choices() {
		if ( ! is_array( $this->choices ) ) {
			$this->choices = [];
		}

		$this->choices = wp_parse_args(
			$this->choices,
			[
				'on'    => esc_html__( 'On', 'kirki' ),
				'off'   => esc_html__( 'Off', 'kirki' ),
				'round' => false,
			]
		);
	}