mix --verbose/MIX_DEBUG=1 does not output enough to understand why the cache is being spoiled

[demerphq]

Elixir and Erlang/OTP versions

$ elixir -v
Erlang/OTP 27 [erts-15.2.2] [source] [64-bit] [smp:11:11] [ds:11:11:10] [async-threads:1] [jit]

Elixir 1.18.2 (compiled with Erlang/OTP 27)

Operating system

macos (N/A)

Current behavior

I was experiencing build cache spoliation due to unknowingly using different versions of elixir to compile a large codebase. Neither MIX_DEBUG=1 nor --verbose helped understand why the cache was being spoiled.

Expected behavior

It would be nice if --verbose or some other option could be used to understand why the cache was being spoiled. IMO if --verbose is being used and the cached is spoiled the output should prominently state why.