Hard cache removal - first JSON serialization has an unusual result

[Destroy666x]

Latest stable JMS Serializer Bundle and JMS Serializer.

Steps to reproduce:

1. rm -rf var/cache/*
2. Attempt to JSON serialize any object with exposed fields defined in .yml configuration with jms_serializer service.
3. The resulting string will look like s:123:"PROPER_JSON_STRING_HERE"; where 123 is the length of the JSON string
4. Attempt to serialize again - the result will be normal.

I'm sure it's a problem of dependencies, but reporting it here just in case. Is it a bug or is there something I'm doing wrong?

[Destroy666x]

Never mind, I did more testing and it seems to be related to Redis rather than this library.