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We sometimes pass the refatble write options as value and sometimes as a pointer. This is quite confusing and makes the reader wonder whether the options get modified sometimes. In fact, `reftable_new_writer()` does cause the caller-provided options to get updated when some values aren't set up. This is quite unexpected, but didn't cause any harm until now. Adapt the code so that we do not modify the caller-provided values anymore. While at it, refactor the code to code to consistently pass the options as a constant pointer to clarify that the caller-provided opts will not ever get modified. Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>