JSONDictionaryFromModel ignores model overrides of dictionaryValue

[jgrandelli]

Previous to 2.0, you could override dictionaryValue in your model and do things like drop keys with null values or arbitrarily drop keys not required for serialization. This is no longer the case with Mantle 2.0. The problem seems to be with this line NSDictionary *dictionaryValue = [model.dictionaryValue dictionaryWithValuesForKeys:propertyKeysToSerialize.allObjects]; in MTLJSONAdapter (line 189). From what I can tell it is possible to subclass MTLJSONAdapter and override serializablePropertyKeys: however this seems to be quite a bit of over head and effort to do things like drop nulls or model specific serialization logic.

[jspahrsummers]

/cc @robb

[github-actions]

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