How to make Stack rebuild the Cabal file when `package.yaml` has changed?

When I use stack I have the following files in the root:

• stack.yaml
• package.yaml
• myProject.cabal

The last one is built automatically by stack build, based on the other two. Accordingly, I expect myProject.cabal to be updated when the other two files change, but that is not the case. As far as I can tell one must delete the cabal file for a new one to be generated.

First obvious question is: Why? Why doens't Stack rebuild the cabal if obviously needs to be changed?

Second question: How do I tell Stack to rebuild the cabal file? I don't want to manually delete the cabal file every time I do a version change or tweak package.yaml.

What I've tried:

One option is to manually delete the cabal file manually, which just seems like a terrible workflow. The other option is to always delete the cabal file (with a custom makefile) this seems hacky and would trigger a full rebuild (since the cabal file changed) everytime!