<addon-foo>/src

Now has meaning, unfortunately this as implemented is a breaking change. And may result in unexpected assets being shipped to production. It is not uncommon for src to be raw typescript source.

Short Term:

• we make this disabled by default
• add-ons supporting module unification will need to opt-in. Either via package.json addon-config entry, or by returning true/false from isModuleUnification() { return false;}