Hello all, As recently raised on the TeX Live mailing list, the LaTeX team feel that the \expanded primitive, suggested for pdfTeX 1.50 around 10 years ago, would be a useful addition to TeX engines. (It is present in LuaTeX.) Attached is a patch which provides the primitive itself (based on the LuaTeX version), an entry for the pdfTeX manual, and some tests. (This is based on the version in https://github.com/josephwright/texlive-source/tree/expanded, slightly adjusted as the tests there also cover other primitives to support XeTeX additions.) I have chosen the pdfTeX manual as the 'home' for documenting behaviour as the idea comes from pdfTeX and as this is usually where 'utility' primitives have been documented. A similar request has been made for XeTeX (for the code part), whilst the (u)pTeX developers already have a Git branch which would add this functionality. We (the team) do hope that general agreement can be reached to make this available in the main engines (pdfTeX, XeTeX, LuaTeX, e-pTeX, e-upTeX) for TL'19. Regards, Joseph