add technical documentation about ref iteration
Signed-off-by: NHeiko Voigt <hvoigt@hvoigt.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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Signed-off-by: NHeiko Voigt <hvoigt@hvoigt.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>