Robuta

https://codereview.chromium.org/11227042/patch/2001/3035 tests/language/arithmetic_test.dart - Issue 11227042: isEven, isOdd, isNegative, isMaxValue,... arithmetic test tests language dart https://api.dart.dev/stable/3.11.1/dart-core/Duration/isNegative.html isNegative property - Duration class - dart:core library - Dart API API docs for the isNegative property from the Duration class, for the Dart programming language. duration class core library property dart api