Details
Minor - P4 Description
The upsertSupplied option to update statements says stability: stable but it an internal implementation detail of $merge.
upsertSupplied:
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description: "Only applicable when upsert is true. If set, and if no documents match
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the query, the update subsystem will insert the document supplied as
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'c.new' rather than generating a new document from the update spec."
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type: optionalBool
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stability: stable
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