strange result from contrib/seg regression on windows

I am seeing this (among other things) when running the seg contrib
module regression:

***************
*** 418,425 ****
ERROR: bad seg representation
DETAIL: syntax error at or near "e"
SELECT '1e700'::seg AS seg;
! ERROR: syntax error
! DETAIL: numeric value 1e700 unrepresentable
--
-- testing the operators
--
--- 418,428 ----
ERROR: bad seg representation
DETAIL: syntax error at or near "e"
SELECT '1e700'::seg AS seg;
! seg
! -----
! 1
! (1 row)
!
--
-- testing the operators
--

Does anyone have a clue why? Can it be fixed? (I'll keep digging, but I
thought someone might be able to say immediately what it is.)

cheers

andrew