A batch operation carrying patch operations rather than a whole document.
Two of these addressing the same item COMPOSE — measured against the
emulator, [set /a, set /b] on one id answers [200, 200] and leaves both
fields set — which is what lets a Unit of Work update one row twice without
the second write discarding the first.
readonly
operationType: "Patch"
The operation kind.
readonly
id: string
The document id.
readonly
resourceBody: { readonly operations: readonly CosmosPatchOperation[]; }
The patch operations, in the envelope the SDK expects.