This Elytron pull request  introduces a minor API change for users of
modifiable security realms who iterate the identities within the realm.
This change affects one test in wildfly-core. I have a commit 
which, if  is accepted, I will relay into a pull request for
wildfly-core which allows the test to compile and run with both the old
and new code.
If anyone sees a problem with changing this API, please let me know ASAP.