* 3.x:
Update CHANGELOG
Add `html_attr_relaxed` escaping strategy
re-add mixed return type
Support short-circuiting in null-safe operator chains
Add support for renaming variables in object destructuring
Update .gitattributes to remove splitsh.json
Fix intro for operator precedence table ?
* 3.x:
Validate the input of CoreExtension::map()
Rename AbstractTest to ProfilerTestCase
Make data providers static
Prepare IntegrationTestCase for static data providers