types(aggregate): allow object syntax for $mergeObjects
#13470
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Fix #13060
Summary
More info here: https://www.mongodb.com/docs/manual/reference/operator/aggregation/mergeObjects/#syntax . Technically you can only use
$mergeObjects: Record<string, string>if using$mergeObjectsin a $bucket, $bucketAuto, or $group stage accumulator, but implementing that is complex and likely not worth the effort.Examples