Enums should be system-types.

[jamoore]

#156 will implement System-Types, which are not creatable by regular users. To prevent weird enum mistakes (specifically: typos, mis-capitalization, leading or trailing whitespace, etc.), IUpdate should reject all new Enum instances (similar to the changes done in r704 for #52). Rather, users will have to use ITypes (or IEnum if preferrable) which will have a @RunAs security annotation. IUpdate will then accept the new instance and normal use can continue.

This may also be dependent on some finer aspects of #114 (the Security Roadmap). For example, the umask permissions on enums must be handled sensitively to allow global reads but only root updates.

A suggestion for the exception thrown would be:

  Warning:

  Your enum value only differs by capitalization and/or 
  whitespace. This is a bad idea. Please reconsider, and 
  then talk to your administrator if this is really what 
  you want to do.

[jmoore]

After the changes to #178, this should happen naturally with #156. Should also implement #145 (unique Enums) at the same time.

[jmoore]

But now that enums are System-Types they also can't be created through IUpdate. r816 adds ITypes.createEnumeration.

[jmoore]

As outlined in #156, r812 and r827 make IEnums System-Types. Use ITypes.createEnumeration for all your enum needs.