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    This is actually a little tricky to do with Lua; see [1] or [2] for solutions to (somewhat) similar problems. Commented Jan 13 at 12:09
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    @UdiFogiel I think that \framed is just a fancy \hbox; I don't think that it shrinks itself to the size of the content while ignoring trailing whitespace. There might be some key/setting that makes it do this that I'm not aware of though. Commented Jan 13 at 13:01
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    If I understand well, your second problem is very similar to problem solved by OpTeX trick 0134 which is based on Lua code and LuaTeX. Commented Jan 13 at 16:22
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    @MaxChernoff see tug.org/TUGboat/tb29-3/tb93hagen-framed.pdf, I was talking about the second example. Commented Jan 13 at 17:34
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    @UdiFogiel That removes any stretch inside the box, not just the trailing stretch. Try the following (replace the | with newlines for readability): \let|=\relax | \define\content{\llap{\the\hsize\ }a\hskip 0pt plus 10pt a\hskip 0pt plus 10pt} | \setupframed[offset=overlay] | \startTEXpage[offset=1ex, loffset=\widthofstring{000.00000pt}] | \framed{\hbox to 20pt{\content}} | \framed[width=20pt, align=disable]{\content} | \framed[width=20pt, align=disable, autowidth=force]{\content} | \framed[width=fit]{\content} | \stopTEXpage Commented Jan 13 at 21:35