* added ignore authData field
* add fix for Postgres
* add test for mongoDB
* add test login with provider despite invalid authData
* removed fit
* fixed ignoring authData in postgres
* Fix postgres test
* Throw error instead of ignore
* improve tests
* Add mongo test
* allow authData when not user class
* fix tests
* more tests
* add condition to synthesize authData field only in _User class
it is forbidden to add a custom field name beginning with `_`, so if the object is not `_User` , the transform should throw
* add warning log when ignoring invalid `authData` in `_User`
* add test to throw when custom field begins with underscore
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