sort bug?

[Jan Jannink]

I'm using this version of sort:

address@hidden /tmp]$ sort --version
sort (GNU textutils) 2.0.11
Written by Mike Haertel.

This file has been sorted:

b_1-a
b_1-a
b1-a
b_1-d
b1-d2
b1-d2
b1-d_2
b1-s
b_1-w
b_1-z
b1-z


Shouldn't the order be:

b1-a
b1-d2
b1-d2
b1-d_2
b1-s
b1-z
b_1-a
b_1-a
b_1-d
b_1-w
b_1-z


An older version of sort is more consistent (check b1-d_2):

sort --version
sort (GNU textutils) 2.0
Written by Mike Haertel.

b_1-a
b_1-a
b1-a
b_1-d
b1-d_2
b1-d2
b1-d2
b1-s
b_1-w
b_1-z
b1-z