This repo demonstrates an issue with the model arg passed via
{{mount}} to an engine where the args are marked as updated on
every render making it hard to build a computed based on the model.
See the broken test in routeless-engine-demo-test.js:
cd packages/ember-engines/
yarn
ember test --filter="can rerender a component in a routeless engine"Note: this appears to be fixed with ember-source@3.22.0, but impacts the LTS (3.20).