\input luaotfload.sty

\pdfprotrudechars2 \pdfadjustspacing2

\font\testa=file:texgyretermes-regular:script=latn at 12pt
\font\testb=file:texgyretermes-regular:script=latn;protrusion=default at 12pt
\testa \input tufte \par
\testb \input tufte \par
\bye