Line Item Subset: include non-numbered members, boolean only for dynamic filtering

Using line item subsets to filter line items in and out of a view is very helpful in giving users the ability to change their view in a single click; however developers are limited to Number-formatted line items. Giving the ability to add non-numerical items to a LISS and limiting the format of a line item dimensionalized by the LISS to boolean would open up a developers ability to give Users more control over dynamic views.