- VEC_SUBSET_OFF_PROC_ENTRIES, which causes VecAssemblyBegin() to assume that the off-process
entries will always be a subset (possibly equal) of the off-process entries set on the
first assembly. This reuses the communication pattern, thus avoiding a global reduction.
+ Subsequent assemblies setting off-process values should use the same InsertMode as the
+ The InsertMode restriction could be removed by packing the stash messages out of place.