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_Image :: attr( String $key = null, Mixed $val = null )
Gets or sets the attributes stored inside this image object, which are used to output HTML attributes. These attributes may be populated by calling this method, or are populated by the image field type in the MasterPress UI. Importantly, these attributes are also passed through to any resizing or filtering methods, so that titles and alt attributes will be preserved when outputting tags after any processing occurs.