fix the lookup algorithm + add a default arg
fix the lookup algorithm + add a default arg
vietj/ceylon-sdk,jeancharles-roger/ceylon-sdk,ASzc/ceylon-sdk,matejonnet/ceylon-sdk,vietj/ceylon-sdk,ASzc/ceylon-sdk,jeancharles-roger/ceylon-sdk,rohitmohan96/ceylon-sdk