Unnecessary to read source data in this situdation

[sabershi]

data: {d1, d2, d3} if i search d, all the records will be cached like Cache[d]:{d1, d2, d3}. Then i search d4, the returned value from Cache[d] is []; if i search c1, the returned value is null. '[]' is not needed to read the source data again

[agarzola]

Thanks for catching that, sabershi.