Yes, it should be the default, but ideally you have the option of preserving history (for PRs where that makes sense) and then your CI/CD should also check that

Yes, it should be the default, but ideally you have the option of preserving history (for PRs where that makes sense) and then your CI/CD should also check that the individual commits build and pass tests. In general, your CI/CD should make sure that each commit that appears in the 'public' history of main builds and passes tests.