A bunch of stuff that wasn't schema definitions ended up in the `schema`
package. Rather than split values up in a bunch of top-level packages,
I think it would be better to have a package-per-app model.
Although KCL is unquestionably a more powerful language, and maps more
closely to my mental model of how host/environment/application
configuration is defined, the fact that it doesn't work on ARM (issue
982]) makes it a non-starter. It's also quite slow (owing to how it
compiles a program to evaluate the code) and cumbersome to distribute.
Fortunately, `tmpl` doesn't care how the values it uses were computed,
so we freely change configuration languages, so long as whatever we use
generates JSON/YAML.
CUE is probably a lot more popular than KCL, and is quite a bit simpler.
It's more restrictive (values cannot be overridden once defined), but
still expressive enough for what I am trying to do (so far).
Dustin