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From:   Junio C Hamano <gitster@pobox.com>
To:     Stefan Beller <sbeller@google.com>
Cc:     Marius Paliga <marius.paliga@gmail.com>,
        "git\@vger.kernel.org" <git@vger.kernel.org>,
        Christian Couder <christian.couder@gmail.com>,
        Jeff King <peff@peff.net>, thais.dinizbraz@gmail.com
Subject: Re: Enhancement request: git-push: Allow (configurable) default push-option
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Date:   Fri, 13 Oct 2017 10:39:32 +0900
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Stefan Beller <sbeller@google.com> writes:

> Junio,
> do we have variables that behave similarly to this?

If you scan Documentation/config.txt, you'll find http.extraHeader
as an example' but I do not recall offhand if that was the original
that introduced the convention, or it merely followed precedence set
by other variables.