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_Image :: __toString()
Overloads the --to-string method to output an appropriate image tag when this field is echoed.
Note: this method is not intended to be called directly.