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aspmx1.migadu.com; dkim=fail ("headers rsa verify failed") header.d=gnu.org header.s=fencepost-gnu-org header.b="lYtWG/oc"; dmarc=pass (policy=none) header.from=gnu.org; spf=pass (aspmx1.migadu.com: domain of "guix-patches-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="guix-patches-bounces+larch=yhetil.org@gnu.org" X-Migadu-Spam-Score: -4.37 Authentication-Results: aspmx1.migadu.com; dkim=fail ("headers rsa verify failed") header.d=gnu.org header.s=fencepost-gnu-org header.b="lYtWG/oc"; dmarc=pass (policy=none) header.from=gnu.org; spf=pass (aspmx1.migadu.com: domain of "guix-patches-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="guix-patches-bounces+larch=yhetil.org@gnu.org" X-Migadu-Queue-Id: 750A43D28A X-Spam-Score: -4.37 X-Migadu-Scanner: scn0.migadu.com X-TUID: w1uWG9uD9Voc Maxime Devos skribis: > iyzsong@outlook.com schreef op za 12-03-2022 om 10:22 [+0800]: >> + (user.name >> +=C2=A0=C2=A0 (git-option-value *unspecified*)) > > I think *unspecified* is considered an implementation detail. Yes, but it may be useful to be able to distinguish between =E2=80=9Cnot specified=E2=80=9D and =E2=80=9Cfalse=E2=80=9D. To do that you can either use =E2=80=98*unspecified*=E2=80=99 or some other= unique value that you=E2=80=99d compare with =E2=80=98eq?=E2=80=99, say: (define ¬-specified (list 'not 'specified)) (define (specified? value) (not (eq? value ¬-specified))) But really, =E2=80=98*unspecified*=E2=80=99 is okay IMO. Ludo=E2=80=99.