Ah. So the issue is really that we would like MPI-2 to be able to support
*layered* implementations of the I/O chapter. Otherwise, MPI could simply bump
the reference counts for the datatypes directly.
It looks like what we need is a routine which does exactly that, then:
Seems to me that in order for this to be useful, newtype must be set to the
same handle as oldtype. This is different from the semantics of MPI_COMM_DUP,
which returns a new handle, so maybe we want to choose a different name?
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