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From: Sebastian Gniazdowski <psprint3@fastmail.com>
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References: <1490020425.2614066.917182456.0E56E387@webmail.messagingengine.com>
Date: Mon, 20 Mar 2017 09:00:46 -0700
Subject: Re: (m)-flag for boundary cases

On the other side, current padding never adds the padding character
unless the string is shorter than the given limit. With the change, it
would add "_" as described "=E6=BC=A2_", suggesting there are no other
characters.

Maybe it should be: not add "_", but do skip the not-fitting character.
This would not meet the "constant length" property..
--=20
  Sebastian Gniazdowski
  psprint3@fastmail.com