I should be able to specify a List Literal in QL

(User Story, Closed -> Fixed, Priority: Critical, Test Status: Unit tested , Reported By Bad Link: Thing 3y284oe not found, )
QL
Summary: In particular, there should be a way for me to provide several elements for a parameter to a QL function.
This is a late-stage need for Eric's custom-search use case.
The big question here is, what's the syntax? In particular, what's the delimiter? This is an important and permanent decision. Parens might work, but think it through carefully.