During code review we discovered a linting inconsistency
https://gerrit.wikimedia.org/r/#/c/319067/7/tests/phpunit/MobileFormatterTest.php,unified
private function makeSectionHeading( $heading, $innerHtml, $sectionNumber=1 ) {
VS
private function makeSectionHeading( $heading, $innerHtml, $sectionNumber = 1 ) {
We should enforce and standardise on one of these styles