bash sort unusual order. Problem with spaces?

Question

Lots of time gone in to a bug, which tracks back to sort...

Can someone explain why I get this unsorted result, when the bash docs tell me the delimiter is a transit

Answer 1

Works right for me:

$ sort myfile.txt
10_1000000 44
10_10000000 19
10_10000001 20
10_10000002 19
10_10000003 17
10_10000004 16
10_10000005 16
10_10000006 16
10_10000007 17
10_10000008 16

$ sort --version
sort (GNU coreutils) 8.5

Perhaps your version requires the -n flag to turn on numerical-sort?