Binary difference in pg_internal.init after running pg_initdbmultiple times

Hi,

In the PG source code function "write_relcache_init_file()", I found that
the whole 'Relation' structs were directly written into the file
'pg_internal.init'. This brings some binary differences of that file,  if we
run pg_initdb multiple times, because the struct 'Relation' contains some
pointer fields.

And my question is : Could we clear the pointer values in 'Relation' before
calling write_item(...)?

No benefit regarding function or performance, just for binary
compatibility... 
Thanks for reading. 




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