To the original requirement of "support a LOC=32 parameter to GETMAIN, giving 
32-bit programs access to a full 4 GiB instead of the current 2 GiB provided by 
LOC=31."

Why not write your own routine to issue an IARV64 GETSTOR with USE2GTO32G=YES 
and then GETMAIN if that fails to find storage? The free could easily check the 
address being freed to decide which service to use on release.

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