[kiwicopple]

> dev-mode assistance/hints for people who may be surprised by this.

We mostly rely on Postgres' errors to bubble up through the client libs which, coincidentally, is one of the things we've improved in this release. Most of the servers now are passing the Postgres errors through, and we're standardizing on the Postgres error format.

There's a lot more we can be doing here, but it's a step in the right direction