Editorial: Change NanosecondsToDays to take an integer

It currently takes a BigInt value but is immediately converted to an
mathematical integer anyway, at the beginning of the operation.

Author: ptomato

spec/duration.html

@@ -1207,17 +1207,16 @@ <h1>
         1. If _relativeTo_ is not present, set _relativeTo_ to *undefined*.
         1. If Type(_relativeTo_) is Object and _relativeTo_ has an [[InitializedTemporalZonedDateTime]] internal slot, then
           1. Let _endNs_ be ? AddZonedDateTime(_relativeTo_.[[Nanoseconds]], _relativeTo_.[[TimeZone]], _relativeTo_.[[Calendar]], 0, 0, 0, _days_, _hours_, _minutes_, _seconds_, _milliseconds_, _microseconds_, _nanoseconds_).
-          1. Set _nanoseconds_ to _endNs_ − _relativeTo_.[[Nanoseconds]].
+          1. Set _nanoseconds_ to ℝ(_endNs_ − _relativeTo_.[[Nanoseconds]]).
         1. Else,
-          1. Set _nanoseconds_ to ℤ(! TotalDurationNanoseconds(_days_, _hours_, _minutes_, _seconds_, _milliseconds_, _microseconds_, _nanoseconds_, 0)).
+          1. Set _nanoseconds_ to ! TotalDurationNanoseconds(_days_, _hours_, _minutes_, _seconds_, _milliseconds_, _microseconds_, _nanoseconds_, 0).
         1. If _largestUnit_ is one of *"year"*, *"month"*, *"week"*, or *"day"*, then
           1. Let _result_ be ? NanosecondsToDays(_nanoseconds_, _relativeTo_).
           1. Set _days_ to _result_.[[Days]].
           1. Set _nanoseconds_ to _result_.[[Nanoseconds]].
         1. Else,
           1. Set _days_ to 0.
         1. Set _hours_, _minutes_, _seconds_, _milliseconds_, and _microseconds_ to 0.
-        1. Set _nanoseconds_ to ℝ(_nanoseconds_).
         1. If _nanoseconds_ &lt; 0, let _sign_ be −1; else, let _sign_ be 1.
         1. Set _nanoseconds_ to abs(_nanoseconds_).
         1. If _largestUnit_ is *"year"*, *"month"*, *"week"*, *"day"*, or *"hour"*, then

spec/zoneddatetime.html

@@ -1276,7 +1276,7 @@ <h1>DifferenceZonedDateTime ( _ns1_, _ns2_, _timeZone_, _calendar_, _largestUnit
         1. Let _intermediateNs_ be ? AddZonedDateTime(_ns1_, _timeZone_, _calendar_, _dateDifference_.[[Years]], _dateDifference_.[[Months]], _dateDifference_.[[Weeks]], 0, 0, 0, 0, 0, 0, 0).
         1. Let _timeRemainderNs_ be _ns2_ − _intermediateNs_.
         1. Let _intermediate_ be ! CreateTemporalZonedDateTime(_intermediateNs_, _timeZone_, _calendar_).
-        1. Let _result_ be ? NanosecondsToDays(_timeRemainderNs_, _intermediate_).
+        1. Let _result_ be ? NanosecondsToDays(ℝ(_timeRemainderNs_), _intermediate_).
         1. Let _timeDifference_ be ! BalanceDuration(0, 0, 0, 0, 0, 0, _result_.[[Nanoseconds]], *"hour"*).
         1. Return ! CreateDurationRecord(_dateDifference_.[[Years]], _dateDifference_.[[Months]], _dateDifference_.[[Weeks]], _result_.[[Days]], _timeDifference_.[[Hours]], _timeDifference_.[[Minutes]], _timeDifference_.[[Seconds]], _timeDifference_.[[Milliseconds]], _timeDifference_.[[Microseconds]], _timeDifference_.[[Nanoseconds]]).
       </emu-alg>
@@ -1285,7 +1285,7 @@ <h1>DifferenceZonedDateTime ( _ns1_, _ns2_, _timeZone_, _calendar_, _largestUnit
     <emu-clause id="sec-temporal-nanosecondstodays" type="abstract operation">
       <h1>
         NanosecondsToDays (
-          _nanoseconds_: a BigInt value,
+          _nanoseconds_: an integer,
           _relativeTo_: *undefined*, a Temporal.PlainDate, or a Temporal.ZonedDateTime,
         )
       </h1>
@@ -1298,8 +1298,6 @@ <h1>
         </dd>
       </dl>
       <emu-alg>
-        1. Assert: Type(_nanoseconds_) is BigInt.
-        1. Set _nanoseconds_ to ℝ(_nanoseconds_).
         1. Let _dayLengthNs_ be 8.64 × 10<sup>13</sup>.
         1. If _nanoseconds_ = 0, then
           1. Return the Record { [[Days]]: 0, [[Nanoseconds]]: 0, [[DayLength]]: _dayLengthNs_ }.