Editorial: Changed names and parameters of AOs to match the equivalents in Temporal:
* `IsValidDurationRecord` now `IsValidDuration`. Takes integers
representing values of units instead of taking an ECMAScript language
value.
* `DurationRecordSign` now `DurationRecord`, likewise takes integers
rather than ECMAScript language value.
Editorial: Changed names and parameters of AOs to match the equivalents in Temporal:
Addresses the concern in this comment on #173
Land after #173