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Improve type safety by making arguments (whether from configuration or from the command line) have their own "struct arg_item" type, separate from the "struct trailer_item" type used to represent the trailers in the buffer being manipulated. This change also prepares "struct trailer_item" to be further differentiated from "struct arg_item" in future patches. Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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