[NTG-context] The odd semantics of \begincsname

Dear list, According to the LuaTeX documentation: “The \begincsname primitive is like \csname but doesn’t create a relaxed equivalent when there is no such name.” I thought it would be possible to use this fact to skip the \relax-ed definition when \def-ining a new control sequence, but the following MWE fails with \inaccessible: \expandafter\gdef\csname yes\endcsname{} \expandafter\gdef\begincsname no\endcsname{} \bye Is this a bug or is this behaviour intended? Could this be fixed by making manufacture_csname aware whether it is in a def_cmd context or not? Cheers, Henri