mach/props and mach/constant conflicting

[stijnopheide]

Use case

Set an environment variable using mach/constant

mach/constant {environment "staging"}

You are not able to use this constant in mach/props

mach/props [config (aero.core/read-config "conf.edn" {:profile (keyword #ref [mach/constant environment])})]

This doesn't work as expected.

The reason for using mach/constant is the ability to pass in another value from the command-line with --constant '{environment "prod"}'.