Given a collection C, should we support isC[Type|Value] queries?

[bradcray]

While working with lists today in a generic programming context, I found myself wanting queries like isListType(), isListValue(), isList() and ended up writing them myself. Should modules that introduce collection types like List.chpl support such queries by convention?

[vasslitvinov]

Creating isList() makes sense.

However, the less-than comparison on types seems just as easy to use:

if (my expression).type <= list then ...