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89baa52da6
The base iterator has a couple of fields that tracks the name, target, object ID and flags for the current reference. Due to this design we have to create a new `struct reference` whenever we want to hand over that reference to the callback function, which is tedious and not very efficient. Convert the structure to instead contain a `struct reference` as member. This member is expected to be populated by the implementations of the iterator and is handed over to the callback directly. While at it, simplify `should_pack_ref()` to take a `struct reference` directly instead of passing its respective fields. Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>