Better v4/5 compatibility wrt CRUD @omit
@benjie sent me here re this Discord thread https://discord.com/channels/489127045289476126/1163877919957995530

tldr: 

* `@omit create` on a table prevents that table's row type from being used as a SQL function input
* Workaround is to use `@behavior -resource:insert`
* Proposed fix is to adjust behavior of `@omit` emulation in v5 to better reflect v4 behavior