Re: [PATCH 24/25] xdiff-interface: support early exit in xdiff_outf()

Ævar Arnfjörð Bjarmason  [off-list ref] writes:

Bridge the gap between the preceding "xdiff-interface: allow early
return from xdiff_emit_{line,hunk}_fn" change and the public
interface. This change was split off from the rest as it wasn't a
purely mechanical addition of "return 0".

Here we want to be able to abort early, but do so in a way that
doesn't skip the appropriate strbuf_reset() invocations.

Nice.

The use of -1 as a return value in the xdiff codebase for early
return, as we'll see more of in subsequent commits.

This is a non-sentence without a verb.  

I started reading the sentence and expected to see "The use of -1,
as opposed to something else, is because of thess deep reasons"
explained, but perhaps you forgot to conclude the sentence with such
an explanation?