Should the default `SEXP` in `r_vector` be a typed vector of length 0 rather than `R_NilValue`?
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调研方向
Start at r_vector's default construction and data_ handling, then inspect how default-constructed vectors currently behave when attributes are assigned. Evaluate the proposed typed, length-zero SEXP against the allocation and noexcept trade-offs, and validate that default construction supports attributes without requiring R_NilValue handling.
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描述
i.e. to support things like https://github.com/r-lib/cpp11/issues/315 where you default construct the vector and immediately try and put attributes on it.
Would also simplify internal code that currently has to account for the possibility of R_NilValue as data_ quite a bit.
We'd have to write our own default constructor but I think that's totally possible?
A downside of this is that the default constructor would have to allocate and would no longer be noexcept or as "cheap", but I can't see that mattering much because you eventually allocate anyways?
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