Unable to test km to mile conversion of half marathon

```

  (:distance)
  module Distance {

    function toMiles(dist) {
      var mi = dist.toDouble() * 0.6213711922d;
      return mi.toDouble();
    }

  }

I have the following Test:

// t.is() == test.assertEqualmessage
// t.ok() == test.assertMessage()
// t.pass() == test.assertMessage(true, msg)
// t.fail() == test.assertMessage(false, msg)

    (:test)
    function testDistance(logger) {

      t.is(dist.toMiles(1), 0.6213711922d, "1km is 0.6213711922 miles");

      var mi = dist.toMiles(21.0975);
      Sys.println(mi); // prints 13.109379

      var mile = 13.109379d;
      Sys.println(mile); // print 13.109379

      if (mile == mi) {
        t.pass("A mile is a mile");
      }
      else {
        t.fail("A mile isn't a mile");
      }

      t.is(dist.toMiles(21.0975), 13.109378728d, "Half marathon distance");
      t.ok(dist.toMiles(21.0975) == 13.109379d, "Half marathon distance");

      return true;
    }

This fails on Exception: ASSERTION FAILED: A mile isn't a mile    File: UnitTests

I'm kinda expecting it all to work.

The problem is because I cannot see what the test sees (as described here https://forums.garmin.com/developer/connect-iq/i/bug-reports/test-assertequalmessage-and-friends-to-show-incorrectness), so from there I'm sitting the values should be correct. Working around it by adding a toString() doesn't work, it still thinks it isn't the same value.