BUG? Max number of function parameters/arguments is limited to 9?

Hi guys,

Today I discoverd something strange in the CIQ environment, the max number of function parameters is limited to 9?

When I write a function with 10 parameters, and call it with 10 arguments accordingly, I get a  "Too Many Arguments Error".

But when I cut the parameters and arguments down to 9, the function works. The error see below.

Error: Too Many Arguments Error
Details: Failed invoking <symbol>

My environment is Mac Mojave, with the Eclipse IDE, SDK version is 3.1.8.

I ran the code in the simulator, haven't test it on real device yet, the target device is Fenix3/HR, CIQ requirement is 1.3.x, both have this error. 

I write some simple code to test this behavior, code like this with 10 parameters will end up with the Error above at the runtime.

function test_arguments(x1,x2,x3,x4,x5,x6,x7,x8,x9,x10) {
    return true;
}

function onLayout(dc) {
    test_arguments(1,2,3,4,5,6,7,8,9,10);
    ...other stuffs...
}

But when I changed it to this, with 9 parameters, it works well, everything is OK.

function test_arguments(x1,x2,x3,x4,x5,x6,x7,x8,x9) {
	return true;
}

function onLayout(dc) {
	test_arguments(1,2,3,4,5,6,7,8,9);
	....other stuffs....
}

What I'm wondering now is, is this a BUG, or it's an expected behavior?

I checked the Programing Guide provided by the SDK, no mention about this limit exist.

I know I can make a workaround on it simply by putting the excessive arguments in an array to pass more arguments,

But if this limit is a legit thing, should it better be part of the compiler check, and give a direct error at the compile time when it comes to functions with 10 and more arguments?

The error message is really confusing, it's telling you your function call has mismatched arguments number, it costs me a huge time try to track down the non-exist "problem", never thought it could be something like this... 

Somebody, please shed me some light?