No, because they are not implemented as read accessors. (They are get accessors that do a little dance to fix-up the lifetime of the returned span. In the fullness of time--specifically when we get an accepted lifetime model and annotations and accessors that support the semantics we need--this will become more natural to write without these measures for non-stdlib types. But what we have today is just enough to make it work for these types now, in a way that we're confident we can support in the future.)
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