Make containers.Map case insensitive

As the title says is there a way to make the mapping case insensitive for string valued input keys?

I would like to make mapObj('A') and mapObj('a') map the same values.

I could define the keySet in lower case and then convert the input keys as

mapObj = containers.Map(keySet,valueSet)  
mapObj(lower(inputKey))

but is there a better way to do this? Could I build the map to be case insensitive?