heap_create with OID?

I am wondering if anyone can see an immediate  problem in creating a function:
   heap_create_oid

which is just like heap_create, but takes an oid arg. This oid (assuming
it's free) would be used to create the object.

This could then bes called from a new 
   heap_create_with_catalog_oid

which in turn will be called from 
   inv_create_oid

to ultimately allow pg_restore to recreate BLOBs, via lo_create_oid.

This plan was developed by simply looking at the LO code in total
isolation, so I am aware it could be totally flawed for the rest of the DB,
but I would appreciate some input...



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