method Temporal.PlainYearMonth.prototype.since
#PlainYearMonth.prototype.since(other: ,options?: DifferenceOptions<"year" | "month">,): Temporal.DurationParameters #
#other: #options: DifferenceOptions<"year" | "month"> optional
#PlainYearMonth.prototype.since(other: ,options?: DifferenceOptions<"year" | "month">,): Temporal.Duration#other: #options: DifferenceOptions<"year" | "month">