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_Field :: exists()
- Boolean true if this field is defined, false if it is not.
Check that this field does indeed exist, in the sense that it is a defined field against the set or object it is requested from.