Allow custom equality comparer when obtaining unique items.
Allow custom equality comparer when obtaining unique items.

mnaiman/duplicati,duplicati/duplicati,duplicati/duplicati,mnaiman/duplicati,duplicati/duplicati,mnaiman/duplicati,sitofabi/duplicati,sitofabi/duplicati,duplicati/duplicati,duplicati/duplicati,mnaiman/duplicati,sitofabi/duplicati,mnaiman/duplicati,sitofabi/duplicati,sitofabi/duplicati