Flow nodes as mapping keys

A mapping key can also be a flow node
and it doesn't need to be explicit!
So you have to stack events in some cases

--- # Just a flow node [a, b, c]

--- # Flow node as a key [a, b, c]: value

Events sequence-start scalar a scalar b scalar c sequence-end

Events mapping-start sequence-start scalar a scalar b scalar c sequence-end scalar value mapping-end

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