LibJS: Replace RoundTowardsZero with truncate

This is an editorial change in the Temporal spec. See:
409ab66

Userland/Libraries/LibJS/Runtime/Temporal/AbstractOperations.cpp

@@ -381,7 +381,7 @@ ThrowCompletionOr<SecondsStringPrecision> to_seconds_string_precision(VM& vm, Ob
     if (fractional_digits_value.is_nan() || fractional_digits_value.is_infinity())
         return vm.template throw_completion<RangeError>(ErrorType::OptionIsNotValidValue, fractional_digits_value, "fractionalSecondDigits"sv);
 
-    // 12. Let fractionalDigitCount be RoundTowardsZero(ℝ(fractionalDigitsVal)).
+    // 12. Let fractionalDigitCount be truncate(ℝ(fractionalDigitsVal)).
     auto fractional_digit_count_unchecked = trunc(fractional_digits_value.as_double());
 
     // 13. If fractionalDigitCount < 0 or fractionalDigitCount > 9, throw a RangeError exception.

Userland/Libraries/LibJS/Runtime/Temporal/Duration.cpp

@@ -1582,19 +1582,19 @@ String temporal_duration_to_string(double years, double months, double weeks, do
     // 1. Let sign be ! DurationSign(years, months, weeks, days, hours, minutes, seconds, milliseconds, microseconds, nanoseconds).
     auto sign = duration_sign(years, months, weeks, days, hours, minutes, seconds, milliseconds, microseconds, nanoseconds);
 
-    // 2. Set microseconds to microseconds + RoundTowardsZero(nanoseconds / 1000).
+    // 2. Set microseconds to microseconds + truncate(nanoseconds / 1000).
     microseconds += trunc(nanoseconds / 1000);
 
     // 3. Set nanoseconds to remainder(nanoseconds, 1000).
     nanoseconds = fmod(nanoseconds, 1000);
 
-    // 4. Set milliseconds to milliseconds + RoundTowardsZero(microseconds / 1000).
+    // 4. Set milliseconds to milliseconds + truncate(microseconds / 1000).
     milliseconds += trunc(microseconds / 1000);
 
     // 5. Set microseconds to remainder(microseconds, 1000).
     microseconds = fmod(microseconds, 1000);
 
-    // 6. Set seconds to seconds + RoundTowardsZero(milliseconds / 1000).
+    // 6. Set seconds to seconds + truncate(milliseconds / 1000).
     seconds += trunc(milliseconds / 1000);
 
     // 7. Set milliseconds to remainder(milliseconds, 1000).

Userland/Libraries/LibJS/Runtime/Temporal/InstantPrototype.cpp

@@ -63,7 +63,7 @@ JS_DEFINE_NATIVE_FUNCTION(InstantPrototype::epoch_seconds_getter)
     // 3. Let ns be instant.[[Nanoseconds]].
     auto& ns = instant->nanoseconds();
 
-    // 4. Let s be RoundTowardsZero(ℝ(ns) / 10^9).
+    // 4. Let s be truncate(ℝ(ns) / 10^9).
     auto [s, _] = ns.big_integer().divided_by(Crypto::UnsignedBigInteger { 1'000'000'000 });
 
     // 5. Return 𝔽(s).
@@ -80,7 +80,7 @@ JS_DEFINE_NATIVE_FUNCTION(InstantPrototype::epoch_milliseconds_getter)
     // 3. Let ns be instant.[[Nanoseconds]].
     auto& ns = instant->nanoseconds();
 
-    // 4. Let ms be RoundTowardsZero(ℝ(ns) / 10^6).
+    // 4. Let ms be truncate(ℝ(ns) / 10^6).
     auto [ms, _] = ns.big_integer().divided_by(Crypto::UnsignedBigInteger { 1'000'000 });
 
     // 5. Return 𝔽(ms).
@@ -97,7 +97,7 @@ JS_DEFINE_NATIVE_FUNCTION(InstantPrototype::epoch_microseconds_getter)
     // 3. Let ns be instant.[[Nanoseconds]].
     auto& ns = instant->nanoseconds();
 
-    // 4. Let µs be RoundTowardsZero(ℝ(ns) / 10^3).
+    // 4. Let µs be truncate(ℝ(ns) / 10^3).
     auto [us, _] = ns.big_integer().divided_by(Crypto::UnsignedBigInteger { 1'000 });
 
     // 5. Return ℤ(µs).

Userland/Libraries/LibJS/Runtime/Temporal/PlainDate.cpp

@@ -295,7 +295,7 @@ DateDurationRecord difference_iso_date(VM& vm, i32 year1, u8 month1, u8 day1, i3
 
         // h. If largestUnit is "week", then
         if (largest_unit == "week"sv) {
-            // i. Set weeks to RoundTowardsZero(days / 7).
+            // i. Set weeks to truncate(days / 7).
             weeks = trunc(days / 7);
 
             // ii. Set days to remainder(days, 7).

Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTime.cpp

@@ -450,7 +450,7 @@ ThrowCompletionOr<NanosecondsToDaysResult> nanoseconds_to_days(VM& vm, Crypto::S
 
     // 4. If Type(relativeTo) is not Object or relativeTo does not have an [[InitializedTemporalZonedDateTime]] internal slot, then
     if (!relative_to_value.is_object() || !is<ZonedDateTime>(relative_to_value.as_object())) {
-        // a. Return the Record { [[Days]]: RoundTowardsZero(nanoseconds / dayLengthNs), [[Nanoseconds]]: (abs(nanoseconds) modulo dayLengthNs) × sign, [[DayLength]]: dayLengthNs }.
+        // a. Return the Record { [[Days]]: truncate(nanoseconds / dayLengthNs), [[Nanoseconds]]: (abs(nanoseconds) modulo dayLengthNs) × sign, [[DayLength]]: dayLengthNs }.
         return NanosecondsToDaysResult {
             .days = nanoseconds.divided_by(day_length_ns).quotient.to_double(),
             .nanoseconds = Crypto::SignedBigInteger { nanoseconds.unsigned_value() }.divided_by(day_length_ns).remainder.multiplied_by(Crypto::SignedBigInteger { sign }),

Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTimePrototype.cpp

@@ -352,7 +352,7 @@ JS_DEFINE_NATIVE_FUNCTION(ZonedDateTimePrototype::epoch_seconds_getter)
     // 3. Let ns be zonedDateTime.[[Nanoseconds]].
     auto& ns = zoned_date_time->nanoseconds();
 
-    // 4. Let s be RoundTowardsZero(ℝ(ns) / 10^9).
+    // 4. Let s be truncate(ℝ(ns) / 10^9).
     auto s = ns.big_integer().divided_by(Crypto::UnsignedBigInteger { 1'000'000'000 }).quotient;
 
     // 5. Return 𝔽(s).
@@ -369,7 +369,7 @@ JS_DEFINE_NATIVE_FUNCTION(ZonedDateTimePrototype::epoch_milliseconds_getter)
     // 3. Let ns be zonedDateTime.[[Nanoseconds]].
     auto& ns = zoned_date_time->nanoseconds();
 
-    // 4. Let ms be RoundTowardsZero(ℝ(ns) / 10^6).
+    // 4. Let ms be truncate(ℝ(ns) / 10^6).
     auto ms = ns.big_integer().divided_by(Crypto::UnsignedBigInteger { 1'000'000 }).quotient;
 
     // 5. Return 𝔽(ms).
@@ -386,7 +386,7 @@ JS_DEFINE_NATIVE_FUNCTION(ZonedDateTimePrototype::epoch_microseconds_getter)
     // 3. Let ns be zonedDateTime.[[Nanoseconds]].
     auto& ns = zoned_date_time->nanoseconds();
 
-    // 4. Let µs be RoundTowardsZero(ℝ(ns) / 10^3).
+    // 4. Let µs be truncate(ℝ(ns) / 10^3).
     auto us = ns.big_integer().divided_by(Crypto::UnsignedBigInteger { 1'000 }).quotient;
 
     // 5. Return ℤ(µs).