I got different results for the second query
(SELECT * FROM iexit ORDER BY 1, 2;) when using -S 64 (on-disk sorting)
and -S 8192 (in-memory).
Could it be caused by this _wrong_ line in pg_operator.h:
DATA(insert OID = 793 ( "<" PGUID 0 b t f 602 602 701 ... path_n_lt ...
^^^
this is float8 but path_n_lt() returns bool...
The same for all path_n_* funcs (may be others too)...
Vadim