Bigger numeric datatypes

[Davin Church]

How hard would it be, since you're already adding various new datatypes, to also support larger numeric datatypes (such as 64-bit integers and 128-bit floats) as native numeric storage codes? I expect we'll be able to use .Net classes that can hold numbers that big/precise, but that's not quite the same as putting them in the same numeric-only APL arrays (and converting between []DR types when needed). I don't often need bigger values, but when I do it's a real pain to have to deal with existing limitations.