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.
WOOF :: protect()
Stores a pointer to the global $post object away so that you can use the variable name $post in your code elsewhere. This has a companion method WOOF::release to set the global $post variable back to its original value.