I thought so, too, at first, but rangeCheck is a private method. It's used in implementing a public API. Calling a non-API method "rangeCheck" and using the sam

I thought so, too, at first, but rangeCheck is a private method. It's used in implementing a public API. Calling a non-API method "rangeCheck" and using the same variable names is clear evidence of a non-clean-room implementation, in my opinion. And in the next slide, the engineer even refers to referencing the Sun code.