Uninformative error message in Object.toJSON()

[jwestbrook]

previous lighthouse ticket #1283
by Victor

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When object passed to Object.toJSON() has cyclic references, function Str() throws error with unclear and uninformative default message (e.g. in Opera Unhandled Error: Incorrect value to a primitive operation):

   for (var i = 0, length = stack.length; i < length; i++) {
      if (stack[i] === value) { throw new TypeError(); }
    }

something pointing to reason of exception like

for (var i = 0, length = stack.length; i < length; i++) {
      if (stack[i] === value) {
        throw new TypeError("Cyclic reference to '" + value + "' in object");
      }
    }

would be much better. Also it is harder to debug code when entire expression if (...) {...} is written on single line - impossible without conditional breakpoint.