Performance improvement for iD.Difference
Performance improvement for iD.Difference

Avoid creating lots of unnecessary temporaries by short circuiting in a
common case.
openstreetmap/iD,morray/iD,energiekollektiv/openmod.sh-id,ngageoint/hootenanny-ui,kepta/iD,kartta-labs/iD,mapmeld/iD,tbicr/iD,kartta-labs/iD,openstreetmap/iD,tbicr/iD,ngageoint/hootenanny-ui,morray/iD,andreic-telenav/iD,mapmeld/iD,bagage/iD,kepta/iD,digidem/iD,bagage/iD,openstreetmap/iD,AndreasHae/iD,edpop/iD,1ec5/iD,AndreasHae/iD,ngageoint/hootenanny-ui,AndreasHae/iD,zbycz/iD,1ec5/iD,digidem/iD,kartta-labs/iD,energiekollektiv/openmod.sh-id,1ec5/iD,mapmeld/iD,zbycz/iD,bagage/iD,edpop/iD,edpop/iD,andreic-telenav/iD