I was going to write a PR for FOSAdvancedEncoder for the new encoders (bcrypt, pbkdf2) and I noticed it's pretty much a duplicate of the core EncoderFactory. it seems a waste to maintain a separate bundle for this simple functionality.
My suggestion is to add this small feature to the core EncoderFactory.

• Does anybody else think the same?
• I need an idea how to build the new config so it won't have BC issues

Use case: different encoder (or bcrypt cost) for user/admin