Description
To shed light on which Normalizers and Denormalizers have been used during Serialization/Deserialization, a WebDebugToolbar Panel might come in handy.

Example
Therefore I've created a small of PoC to showcase a possible solution (in Userland for now). I tried to described, how I've implemented it on the README.

https://github.com/Basster/Symfony-Serializer-Collector-PoC

#SymfonyHackday