Masterpress 1.3.6 is a compatibility release. It resolves an edge case with shared fieldsets not working for MySQL 8 when the fieldset is limited to more than 1 post type or taxonomy or excluding any post types or taxonomies.
MPFT_RelatedPost :: count()
Return the count of posts selected in the UI. Since this provides a method for MEOW_Field::count to forward to, the number of posts can also be retrieved by calling count directly on the field object.