Merge Rows (Diff) - Does not report changed - 4.2.0-stable

Is anyone else having this problem with "Merge Rows (Diff)"? Thanks, David Link, Irvington, NY

Given these input files:

one.csv
--------
key,value
1,one
2,two
3,three

two.csv
--------
key,value
1,one
2,verydifferenthere
4,four

Gives this output:
out.csv
--------
key,value,flagfield
1,one,identical
2,two,identical
3,three,deleted
4,four,new

The (2) record should be 'Changed' not 'Identical', and it should provide the new value: 'verydifferenthere'