Multiple parameters to FunctionCallOperator, suggestion that the space should be optional

[jcalfee]

In FunctionCallOperator I am looking to support multiple arguments. Adding a console log shows the function is being called twice (strange) and the second time the second argument is undefined (bug?).

> meval('Spread(4,2)', { Spread: function(a, b){return [a, b]} })
[ 4 ]
[ 4, undefined ]

FunctionCallOperator

  execute (context, myIndex, entities) {
    console.log(this.args) // !!
    let prevIndex = myIndex - 1;
    let leftSide = this.resolveSide(entities[prevIndex], context);
    let result = leftSide.apply(null, this.args);

    entities.splice(prevIndex, 2, result);
  }

Also, seems like the spread operator should work since that is outside of the parser:

> meval('Spread(4,2)', { Spread: function(...args){return args} })
[ 4 ]
[ 4 ]

Also here:

> meval('Math.max(2,4)', {})
[ 2 ]
2

[jcalfee]

I see .. Everything works above if I put a after each comma. So, Math.max(2, 4) works but Math.max(2,4) does not.