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ECMA-48 defines SGR 21 as enabling double-underline. PuTTY interprets this the same as single-underline (SGR 4). SCOANSI and Linux interpret it as turning off bold, and at least some applications seem to rely on this. VT520 and xterm don't support this sequence at all. Perhaps PuTTY should align its behaviour with one of the others. xterm would be more ideologically pure, but SCOANSI might be more generally useful.
Audit trail for this semi-bug.