I think this question is related enough to be added to this thread as it gets to the same basic idea of how magic affects regular creatures also affects construct creatures. If it should be posted separately, I apologize.
Constructs are immune to Ability Damage and Drain, but does that also mean they are immune to spells that enhance ability scores: Cat's Grace, Owl's Wisdom, etc.? Presumably Bear's Endurance would not because constructs have no constitution score to enhance, but what about the rest?
Logically it seems that if you can't decrease those abilities, the reverse would also be true, but I can't find any evidence in the rules that substantiates that at all.