363946e17f
[Int]CoordTyped no longer inherits Units because otherwise instances of [Int]IntPointTyped may get one Base subobject because it inherits Units, and others because of BasePoint's Coord members, which end up increasing the [Int]CoordTyped's objects size (since according to the ISO C++ standard, different Base subobject are required to have different addresses). Differential Revision: https://phabricator.services.mozilla.com/D160713
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