bbl_is_page should accept an array of page IDs or page slugs as is_page does

It currently accepts only single values. See the implementation of WP_Query::is_page for more details https://developer.wordpress.org/reference/classes/wp_query/is_page/

Start by comparing bbl_is_page with the linked WP_Query::is_page implementation and identify the existing entry point for the helper. The work is complete when bbl_is_page accepts arrays of page IDs or page slugs in the same way as is_page, while retaining support for single values.

Written by the indexing model from the issue text.