aral, 
Heads up anyone playing with Kitten at the moment (yes, both of you):
I’m in the process of upgrading Kitten’s version of JSDB from 4 to 5.
This is a breaking change.
This will affect you if you’re persisting custom objects (instances of your custom model classes) in your databases.
Please see the details in this JSDB announcement post and the linked-to details page to prepare:
https://mastodon.ar.al/@aral/112361559531645603
(I should have the update out this afternoon.)