815d3683f7
when LUA_PATH contains `;;`, it is replaced by `;LUA_PATH_DEFAULT;` in lua 5.1: Updated https://github.com/lua/lua/blob/69ea087dff1daba25a2000dfb8f1883c17545b7a/loadlib.c#L599 More recent versions might be smarter ? https://github.com/lua/lua/blob/65b07dd53d7938a60112fc4473f5cad3473e3534/loadlib.c#L301