Sorry, first pull request. I added the Image and File use statements as requested. And surrounded the has_many example with the class name so it makes more sense.
Adding a relationship to core classes brings some extra syntax issues. I think it would be usefull to not that core classes are realted through Image::class and that a has-one-relationship needed on a core class when relating them thru has_many, can be set up through yml.
* API Support many_many through polymorphic relations (from side only)
Fixes#7911Fixes#3136
* Add extra docs and allow optional arguments
* ENHANCEMENT Enable quiet to be turned off
* BUG Fix issue with manymanythroughlist duplication
API Add DataObject::setComponent()
API Support unary components as getter and setter fields
API ManyManyList::add() now supports unsaved records
ENHANCEMENT Animal farm
API Remove DataObject::validateModelDefinitions, and move to DataObjectSchema
API Remove deprecated 3.0 syntax for addSelect()
API made DataList::createDataObject public
API Move component parsing logic to DataObjectSchema
API Remove support for triangular has_many / belongs_many relationships