Making _defaults concrete; rename model option to tagModel.
Removing syncing between options data and entity.
Support storing tags in serialized form.
Automatically detect if we can store arrays.
Revert to use data from options; simplify.
Extract serialize, normalize methods.
Sort when normalizing.
Normalize all kinds of values.
Refactor tags method.
Split up tags method.
Use singular for variable name.
Drop fixme.
Refactor save filter.
Reorder methods.
State new requirement; convert to new array syntax.