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long long smallest_invalid = last_set << 52;
to
long long smallest_invalid = last_set << 53;

1844674407366955264,
1844674407366955776,
...
1844674407366963968,
1844674407366964480,
1844674407366964992

use warnings;
use Benchmark;
...

die "Error in at least one of the XSubs" unless $count1 == $count2;
__END__

Benchmark: timing 1 iterations of uv_fits_double3, uv_fits_double_bitf
+iddle...
uv_fits_double3:  0 wallclock secs ( 0.44 usr +  0.00 sys =  0.44 CPU)
+ @  2.29/s (n=1)
...
uv_fits_double_bitfiddle:  1 wallclock secs ( 0.94 usr +  0.00 sys =  
+0.94 CPU) @  1.07/s (n=1)
            (warning: too few iterations for a reliable count)
12000001 12000001