From f67cff9b17798b41429e8382ffd15f4d1a2b854f Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Tue, 12 Mar 2019 12:08:10 -0400
Subject: ob_set_substvar(): Don't allow "_" in variable names

The character was allowed due to the details of the implementation, but
the SPF 2.0 specification doesn't allow it.
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