[tommica]

>> It happens when you deduplicate code which isn’t an exact duplicate, but only appears to be.

Embarrassing to admit, but until now I didn't think in this perspective - and on hindsight it should be obvious, sometimes code might look duplicate, but is not

[ficklepickle]

Or it starts as duplicate but diverges over time. I've been bitten by the premature deduplication.

[jacobush]

Or worse, the natural progression should be that they diverge, but because they now share some kind of "reused" code in a library or class, an abomination is added to one or both users, just to keep the original "shared" feature.

Great fun.