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When the second argument is known, the helper should be specialized.

$.ltB = function(a, b) {
  return typeof a === 'number' && typeof b === 'number' ? a < b : $.lt$slow(a, b) === true;
};

$.lt$slow = function(a, b) {
  if ($.checkNumbers(a, b))
    return a < b;
  return a.operator$lt$1(b);
};

...
  if ($.ltB(index, 0))
    return;

This should be specialized, adding:

$.ltB_0 = function(a) {
  return typeof a === 'number' ? a < 0 : a.operator$lt$1(0) === true;
};

  if ($.ltB_0(index))
    return;

In my hand-optimizing experiments, the specialization was important, especially for the common cases (constants like 0, 1). Simply specializing on type leaves the JS engine with multiple representations for b.

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This comment was originally written by @bp74

I have a lot of code where the compiler knows that the left and right side of the operation are integers, but operators like >> or ~/ are executed with the helper methods. In such cases the performance is much(!) slower compared to native (or inlined) JavaScript code. Another consequence is that the compiler does not know that the operation has no side effects, which kills optimizations like range analysis for indexers.

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Is there anything left to do for this, Nicolas?

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This comment was originally written by ngeoffray@google.com

Yes, we don't create specialized interceptors based on the argument type/value.

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This comment was originally written by ngeoffray@google.com

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Closing as obsolete - we don't do interceptors that way anymore.