* move filtering of serializer fields out of functions into mixin
* fix def
* temp fix
* rollback rollback
* more adoption
* fix many serializer behaviour
* optimize mro
* set many serializer
* adjust default filtering
* fix import
* add missed field
* make can_filter suppport more complex scenarios:
- different filtername from fieldname
- multiple fields with one filtername
* fix removal
* fix schema?
* add missing def
* add test
* fix schema fields
* fix another serializer issue
* further fixes
* extend tests
* also process strings
* fix serializer for schema
* ensure popped values are persisted
* move test around
* cleanup
* simplify tests
* fix typo
* fix another test
* var tests
* disable additional tests
* make application of PathScopedMixin more intentional -> more efficient
* make safer to use with various sanity checks
* fix list serializer
* add option to ignore special cases
* generalize addition
* remove generalize addition
* re-add missing schema generation exception
* remove new duplication
* fix style
* adjust naming and docs, add typing to clean stuff up
* simplify more
* fix ref calc
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