Add 100% test coverage

Author: ehmicky

.github/workflows/workflow.yml

@@ -1,9 +1,5 @@
 name: Build
 on: [push, pull_request]
-env:
-  # This projects has many layers of nested processes making test coverage not
-  # work correctly
-  COVERAGE: 'false'
 jobs:
   combinations:
     # git push --tags does not create any commits so should not trigger a new

CHANGELOG.md

@@ -121,6 +121,10 @@ TypeScript types have been simplified.
 - Do not crash when `error.stack` is `undefined` or `null`
 - Support cross-realm errors
 
+## Internal
+
+- Add 100% test coverage
+
 # 9.4.0
 
 ## Features