CSHARP-4935 allow Linq Translation conversion from interface to deriv… #1250
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…ed type.
This will allow for a proper "downcasing" of the type. With my proposed changes we will now be able to run filters if the collection type is an interface.
I also had to change the default implementation of how the DiscriminatedInterfaceSerializer works as there would always be an exception as the object serializer enforces a whitelist for types to be serialized. I would actually like it better if we would instead resolve the class map of the underlying type to serialize a dependent object, but I did not want to touch on this in this PR.
I am unsure about the placement of the ConvertExpressionToFilterTranslatorTest as it is a bit different to the other tests in that file, but it was the only way to trigger the conversion in ConvertExpressionToFilterFieldTranslator