Source

File: wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php

protected function handle_status_param( $new_status, $comment_id ) {
		$old_status = wp_get_comment_status( $comment_id );

		if ( $new_status === $old_status ) {
			return false;
		}

		switch ( $new_status ) {
			case 'approved':
			case 'approve':
			case '1':
				$changed = wp_set_comment_status( $comment_id, 'approve' );
				break;
			case 'hold':
			case '0':
				$changed = wp_set_comment_status( $comment_id, 'hold' );
				break;
			case 'spam':
				$changed = wp_spam_comment( $comment_id );
				break;
			case 'unspam':
				$changed = wp_unspam_comment( $comment_id );
				break;
			case 'trash':
				$changed = wp_trash_comment( $comment_id );
				break;
			case 'untrash':
				$changed = wp_untrash_comment( $comment_id );
				break;
			default:
				$changed = false;
				break;
		}

		return $changed;
	}