The `kSelectionCache` type was introduced on bug 1261299 for Mac only, currently it doesn't support clipboard owner and non-set operations, such as `getData` or `hasDataMatchingFlavors`. I am not sure if that is intentional, but perhaps we could consider extending its capabilities to align more with other clipboard types, though there is no use case so far, but it could make the clipboard code simper and generic.
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The `kSelectionCache` type was introduced on bug 1261299 for Mac only, currently it doesn't support clipboard owner and non-set operations, such as `getData` or `hasDataMatchingFlavors`. I am not sure if that is intentional, but perhaps we could consider extending its capabilities to align more with other clipboard types, though there is no use case so far, but it could make the clipboard code simper and more generic.