Unexpected zero seconds shown in Duration.prototype._repr_ output

[justingrant]

The debugging-only _repr_ getter (which is used to show the contents of a Duration in the polyfill while debugging with Chrome devtools console) has an extra 0.0S appended to its output that should not be there. The output should match toString().

Repro: run the following code in Chrome devtools console:

Temporal.Duration.from('P73DT4H')

Expected: Duration {_repr_: "Temporal.Duration <P73DT4H>"} (_repr_ should have same output as toString())
Actual: Duration {_repr_: "Temporal.Duration <P73DT4H0.0S>"}

Note that the _repr_ is only for debugging the pre-production polyfill. It's not present in the 262 spec so fixing this won't affect the spec.