Serializer configuration

[dup2]

We are trying to update from an old version 0.4.8 to the newest for an older application.

It seems the serializer has changed, now for example boolean values are stored as "--- 'false'\n". (yaml).
This breaks other applications which read from the stored database values.

Any change this can be configured or changed? As the model is not namespaced, we can not easily extend it IMHO.