Anonymous struct

[mumia]

Hi.

Was investigating this lib to use in a project and ran into some issues with payload registration.

Wanted to ask why the use of anonymous structs is even allowed. See https://github.com/hellofresh/goengine/blob/master/strategy/json/payload_transformer_test.go#L139

They seem to result in an empty string when you try to reflect their name.

[mumia]

I have a fix for the issue, but wanted to understand if anonymous structs are really a necessity or were just used to simplify testing.