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Instead, just proceed with the infinity or zero result that it should return for overflow/underflow. This avoids a platform dependency, in that various versions of strtod are inconsistent about whether they signal ERANGE for a value that's specified as infinity. It's possible this won't be enough to remove the buildfarm failures we're seeing from ac75959cd, in which case I'll take out the infinity test case that commit added. But first let's see if we can fix it. Discussion: https://postgr.es/m/E1h33xk-0001Og-Gs@gemulon.postgresql.org
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