==== VARIATION: query={ a,[]~|-<>: 1 }, sort={}, proj={}
eqa\,\[\]~\|\-<>|||fc
==== VARIATION: query={}, sort={ a,[]~|-<>: 1 }, proj={}
an|aa\,\[\]~\|\-<>||fc
==== VARIATION: query={}, sort={}, proj={ a,[]~|-<>: 1 }
an||_id-a\,\[\]~\|\-<>|fc
==== VARIATION: query={}, sort={}, proj={ a: "foo,[]~|-<>" }
an||_id|fc
