OptionalownThe links whose answers are the reader's own, rather than carried into
this response from a response answering it. When a carried link would
carry a value one of these carries the other way, only the carried link
is dropped (overriddenByOwn) and the difference is reported in
collisions, so the reader's value wins at every step of a chain.
Without it, every answer counts as the reader's own and any two links
carrying opposite values both carry nothing (conflict).
Options for
ArgumentEngine.carryAnswers.