Object should be frozen after being deserialized from Solr in ActiveFedora::LoadableFromJson#init_with_json

[jrgriffiniii]

Currently, resource attributes are populated from the Solr Document, but the resource itself isn't frozen immediately following this:

      @resource = SolrBackedResource.new(self.class)
      self.attributes = adapt_attributes(attrs)
      # TODO: Should we clear the change tracking, or make this object Read-only?

      yield self if block_given?

      run_callbacks :find
      run_callbacks :initialize
      freeze

https://github.com/samvera/active_fedora/blob/master/lib/active_fedora/loadable_from_json.rb#L133