KeystorePasswordStore contains inconsistency about MODIFIABLE configuration attribute.

Here it is used MODIFIABLE attribute:
https://github.com/wildfly-security/wildfly-elytron/blob/1.1.0.Beta10/src/main/java/org/wildfly/security/credential/store/impl/KeystorePasswordStore.java#L275

But it is missing between supported configuration attributes:
https://github.com/wildfly-security/wildfly-elytron/blob/1.1.0.Beta10/src/main/java/org/wildfly/security/credential/store/impl/KeystorePasswordStore.java#L222

I cannot see any condition with isModifiable() in store() or remove() method:
https://github.com/wildfly-security/wildfly-elytron/blob/1.1.0.Beta10/src/main/java/org/wildfly/security/credential/store/impl/KeystorePasswordStore.java#L317

In my opinion MODIFIABLE attribute should be supported otherwise please remove code about MODIFIABLE from initialize() method.