Currently only cacheAt:ifAbsentPut: exists on Canvas, but wouldn't it be
nicer to expand it to expose/generalize for:at:ifAbsentPut: from
CairoBackendCache, rather than create two new class variables?
When most of the asAthensPaintOn: dispatch through surface, that seems a
nicer place to do the lookup (even though it rarely/ever change in
practice), no?
Cheers,
Henry
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