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.
MEOW_FieldSet :: has()
Checks to see if this field set has a field by the given name, but also if that field has a value available, returning the field itself if it is available, or boolean false otherwise. This is the most readable way to conditionally output HTML that surrounds a field value.