Question on + and type conversions

[P T Withington]

If I define an object with both valueOf and toString methods:

  var color = {
    valueOf: function () { return 0xff0000; }
    ,toString: function () { return 'red'; }
  }

The rules of `+` result in:

  color + 1 => 16711681

  color + '' => '16711680'

This is because of:

> 11.6.1 The Addition operator(+)
> ...
>   7. If Type(lprim) is String or Type(rprim) is String, then
>    a. Return the String that is the result of concatenating ToString(lprim) followed by ToString(rprim)
> ...

Is it intentional that after discovering that one of the operands' primitive value is a string, that toString is called on the other operand's primitive value, rather than its (original) value?  Because I was hoping:

  color + '' => 'red'