I opened a couple of PRs https://github.com/juxt/aero/pull/74 https://github.com/juxt/aero/pull/72 in case someone is interested

has anyone thought about adding Spec validation for Aero?

it's quite easy to do also without much support in the library, but I wonder if it's something that might be worth adding

Probably better as a post-processing step. The validation you choose is going to vary with your domain, and it's not like aero can do anything clever to help with your specs.

Besides that, I'm not keen on using the apis until they're stable anyway.

👍