Js macro can't return false

[fish-404]

I write a Js macro for some checking. Initially, I want to let it return a bool value. I find it return nothing when the marco return false, but it will show text "true" when the macro return true.

I am not sure about if is my macro's mistake. Then I write a simplest Js macro just accept a value then return bool, like:

exports.name = "testBool";

exports.params = [
   {name: "testPara"}
];

/*
Run the macro
*/
exports.run = function(testPara) {
   if (testPara === "true")
       return true;
   else 
       return false;
};

If I call the macro like <<testBool true>> in tiddler, it will show true, but if I call the macro like <<testBool false>>, it show nothing. I also try to return 0 or 1, it seems have the same behavior.

Finally, I take string true and false to return instead. But I wonder if there is something special to have this limit ?

[Jermolene]

Hi @fish-404 JavaScript macros in TiddlyWiki must return a string result; Boolean results are not supported.

[fish-404]

Thank you. I read the TiddlyWiki Dev document again, find I missing the run section point:

The run function should return the string value of the macro.

But is it possible to make some hints or forbid true result shown when macro called.
If someone write a JavaScript macro and use other types to return, some result can be shown, and others can't be shown, it seems a little confused. Like I return boolean result incorrectly, the true result will be shown, but false result won't be shown. It's possible to give a hint or forbid true be shown ?

[Jermolene]

The result of the macro function is coerced to a string with .toString(), so macros that return the wrong type do not cause a failure.