Schema def prop allow support definition objects

[ksafranski]

Since a schema property can be shared it can create a single-source for configurations. As such, one area where this applies well is allow; it's accepted values and any metadata associated with those, for example:

status: { type: 'string', allow: [ 'prog', 'comp', 'arch' ] }

Maintaining enums in a separate location for the allow "keys" ([ 'prog', 'comp', 'arch' ]) presents the challenge of maintaining this in multiple locations.

Proposed Solution

Currently allow supports either a string or an array. The proposal would be to expand this to also allow an object:

status: { type: 'string', allow: { 'prog': 'in progress', 'comp': 'completed', 'arch': 'archived' } }

The above would simply process to allow the keys of the object as values, but the whole object could then be maintained in a lib (or in the model) and shared easily.