Comment 1 for bug 719182

One way to do this that might fit cleanly with the registry of them, and with wgrant's recent declaration of a value domain, and that might work well from tal, would be for the default getFeatureFlag to just interpret the string from the database into whatever type is expected.

We could also (perhaps as a separate bug) validate that values entered into the admin ui match what is that expected.

In both cases we need to tolerate unknown flags and just treat them as strings.