Consider using zeros for zero values, not nulls, in box.dart.

This code uses List:

https://github.com/flutter/devtools/blob/3510c12d392547721d444338d4e45942092f8738/packages/devtools_app/lib/src/screens/inspector/layout_explorer/box/box.dart#L186

We need to either start using 0 instead of null or explain in comments what is the difference between 0 and null in the array.

Start in packages/devtools_app/lib/src/screens/inspector/layout_explorer/box/box.dart at line 186 and inspect how the List values are created and consumed. Determine whether null and 0 have distinct meanings in this array; done means consistently using zero values or documenting the difference in comments.

Rédigé par le modèle d'indexation à partir du texte de l'issue.