//can't use typeof

>typeof MinKey

object

//not === comparable (should make singleton?)

> db.max.findOne()._id

{ "$maxKey" : 1 }

> db.max.findOne()._id === MaxKey

// no instanceof support...

> "a" instanceof MinKey

Fri Jan 18 18:07:21.863 javascript execution failed (shell):1 TypeError: Expecting a function in instanceof check, but got a

"a" instanceof MinKey