method Temporal.PlainTime.prototype.round
PlainTime.prototype.round(roundTo: RoundTo<"hour"
| "minute"
| "second"
| "millisecond"
| "microsecond"
| "nanosecond">): Temporal.PlainTime
roundTo: RoundTo<"hour"
| "minute"
| "second"
| "millisecond"
| "microsecond"
| "nanosecond">