[Gretl-devel] isnull() / exists() documentation for lists reloaded

Hi, I stumbled again over the issue that a "null" default for list types as a function argument requires different checks than "null" defaults for a string, for example. (For lists, only nelem(listinput)==0 will really work, whereas for string and other types one has to use !exists(stringinput).) This has been discussed before on the mailing list(s). However, if I look up the function reference for exists() or nelem() or isnull(), this doesn't seem to be mentioned, but it would be useful. thanks, sven