Aggregation explain plan returns non-boolean 'isMultiKey' value

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      var res = db.fakeColl.aggregate([], {explain: true});
printjson(res);

assert.eq(typeof res.stages[0].plan.isMultiKey, "boolean");
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      var res = db.fakeColl.aggregate([], {explain: true }); printjson(res); assert .eq(typeof res.stages[0].plan.isMultiKey, " boolean " );
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      I would expect aggregation explain plans to return a boolean value for isMultiKey instead of the string "isMultiKey". Here's the output from the included JS test:

      {
	"stages" : [
		{
			"query" : {
				
			},
			"plan" : {
				"cursor" : "BasicCursor",
				"isMultiKey" : "isMultiKey",
				"scanAndOrder" : false,
				"allPlans" : [
					{
						"cursor" : "BasicCursor"
					}
				]
			}
		}
	],
	"ok" : 1
}
assert: ["string"] != ["boolean"] are not equal : undefined

      Version: 735a759908a3a8e792909eb23160ec29eba83e9c

            Assignee:
            Mathias Stearn
            Reporter:
            Kamran K. (Inactive)
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              Created:
              Updated:
              Resolved: