The most important API design principle
summary
Claims that APIs should expose Non owning interface views not owning containers, demonstrates this with QStringView and by changing QRegion to be QRegion iterable so callers iterate without forcing allocations. Implementation detail: keep inline small-storage, return begin/end into that or a vector. Result: library binary loses 3 kilobytes saved of text and code removes special-case allocation logic, showing the idea works and enables swapping internal containers.
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