[textutils] Sort inconsistancy with -u switch

[BruceP]

Gday,
        I just tripped over a gotcha in sort 

Input data pre-sorted (not relevant just saves a list)

000011k TEUR/am5
000013k TEUR/am3
000013k TEUR/am4
000014k TEUR/am6
000016k TEUR/am9
000017k TEUR/am4
000017k TEUR/am7
000019k TEUR/am3
000020k TEUR/am8

Now the output is the same as the input for 
sort 
sort -u
sort -n

But if use
sort -u -n
you get

000011k TEUR/am5
000013k TEUR/am3
000014k TEUR/am6
000016k TEUR/am9
000017k TEUR/am4
000019k TEUR/am3
000020k TEUR/am8

It appears as if the -n force comparison on only initial numeric field. So 
lines are made uniq based soully on this. Traditionally sort also sorted on 
the remainder of the record as well. This feature occurs in V1.33 & V2.0

BruceP