Content-Transfer-Encoding should default to 7bit when it's not
given (RFC2045). MIME-PART already defaults to this when manually
constructing this, but MAKE-MIME-PART would always set it, so it would
sometimes be NIL which is incorrect. We now correctly fall back to :7bit
in this case.
Additionally, we make sure that KEYWORDIFY-ENCODING immediately returns
when it's given NIL.
Change-Id: I50f86dd649d83a4c3a8881d6e13dcada889d5521
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12857
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
Autosubmit: sterni <sternenseemann@systemli.org>
Externally developed dependencies which have been imported ("vendored") into
this repository. These dependencies come with their own licenses and whatever
else.
Code that is developed inside of this repository, but released to an external
repository via Copybara.