> you should probably use === by default.

unfortunately this can also backfire if your class/module is used in a different context where it gets strings instead of integers and you were just using === without really thinking about it:

We had a case where the code was something like:

  function doSomething($value) {
    if ($value === 0) {
      //do something
    } else {
      //do something else
    }
  }

This was then used in a slighly different context where $value was a string '0', it then ended up incorrectly in the //do something else block, doing the completely wrong thing. In this case the type co-erced == would have been better, and I think what the developer was expecting would be a type error due to the === but it's not a type error, it'll just fall into the else block.