Editorial: Use "either" or "one of" when comparing multiple items

As per editorial conventions, 'prefer "if a is either b or c" over "if a
is b or a is c"; use "one of" in place of "either" when more than 2
options'
https://github.com/tc39/ecma262/wiki/Editorial-Conventions#comparisons

Author: ptomato

spec/abstractops.html

@@ -456,7 +456,7 @@ <h1>
       1. If _digitsValue_ is not a Number, then
         1. If ? ToString(_digitsValue_) is not *"auto"*, throw a *RangeError* exception.
         1. Return ~auto~.
-      1. If _digitsValue_ is *NaN*, *+∞*<sub>𝔽</sub>, or *-∞*<sub>𝔽</sub>, throw a *RangeError* exception.
+      1. If _digitsValue_ is one of *NaN*, *+∞*<sub>𝔽</sub>, or *-∞*<sub>𝔽</sub>, throw a *RangeError* exception.
       1. Let _digitCount_ be floor(ℝ(_digitsValue_)).
       1. If _digitCount_ &lt; 0 or _digitCount_ > 9, throw a *RangeError* exception.
       1. Return _digitCount_.
@@ -587,8 +587,8 @@ <h1>
       1. If _value_ is ~unset~, return ~unused~.
       1. If _extraValues_ is present and _extraValues_ contains _value_, return ~unused~.
       1. Let _category_ be the value in the “Category” column of the row of <emu-xref href="#table-temporal-units"></emu-xref> whose “Value” column contains _value_. If there is no such row, throw a *RangeError* exception.
-      1. If _category_ is ~date~ and _unitGroup_ is ~date~ or ~datetime~, return ~unused~.
-      1. If _category_ is ~time~ and _unitGroup_ is ~time~ or ~datetime~, return ~unused~.
+      1. If _category_ is ~date~ and _unitGroup_ is either ~date~ or ~datetime~, return ~unused~.
+      1. If _category_ is ~time~ and _unitGroup_ is either ~time~ or ~datetime~, return ~unused~.
       1. Throw a *RangeError* exception.
     </emu-alg>
   </emu-clause>
@@ -1809,7 +1809,7 @@ <h1>
     </dl>
     <emu-alg>
       1. Let _number_ be ? ToNumber(_argument_).
-      1. If _number_ is *NaN*, *+∞*<sub>𝔽</sub> or *-∞*<sub>𝔽</sub>, throw a *RangeError* exception.
+      1. If _number_ is one of *NaN*, *+∞*<sub>𝔽</sub>, or *-∞*<sub>𝔽</sub>, throw a *RangeError* exception.
       1. Return truncate(ℝ(_number_)).
     </emu-alg>
   </emu-clause>
@@ -1851,9 +1851,9 @@ <h1>
       1. Let _fields_ be an empty Calendar Fields Record with all fields set to ~unset~.
       1. Let _calendarDate_ be CalendarISOToDate(_calendar_, _isoDate_).
       1. Set _fields_.[[MonthCode]] to _calendarDate_.[[MonthCode]].
-      1. If _type_ is ~month-day~ or ~date~, then
+      1. If _type_ is either ~month-day~ or ~date~, then
         1. Set _fields_.[[Day]] to _calendarDate_.[[Day]].
-      1. If _type_ is ~year-month~ or ~date~, then
+      1. If _type_ is either ~year-month~ or ~date~, then
         1. Set _fields_.[[Year]] to _calendarDate_.[[Year]].
       1. Return _fields_.
     </emu-alg>

spec/calendar.html

@@ -641,7 +641,7 @@ <h1>
               1. Set _years_ to _candidateYears_.
               1. Set _candidateYears_ to _candidateYears_ + _sign_.
           1. Let _months_ be 0.
-          1. If _largestUnit_ is ~year~ or _largestUnit_ is ~month~, then
+          1. If _largestUnit_ is either ~year~ or ~month~, then
             1. Let _candidateMonths_ be _sign_.
             1. Repeat, while ISODateSurpasses(_sign_, _one_, _two_, _years_, _candidateMonths_, 0, 0) is *false*,
               1. Set _months_ to _candidateMonths_.
@@ -822,8 +822,8 @@ <h1>
         <dd>It returns the number of days in the given year and month in the ISO 8601 calendar.</dd>
       </dl>
       <emu-alg>
-        1. If _month_ is 1, 3, 5, 7, 8, 10, or 12, return 31.
-        1. If _month_ is 4, 6, 9, or 11, return 30.
+        1. If _month_ is one of 1, 3, 5, 7, 8, 10, or 12, return 31.
+        1. If _month_ is one of 4, 6, 9, or 11, return 30.
         1. Assert: _month_ = 2.
         1. Return 28 + MathematicalInLeapYear(EpochTimeForYear(_year_)).
       </emu-alg>
@@ -1202,7 +1202,7 @@ <h1>
       </dl>
       <p>The operation throws a *TypeError* exception if the non-~unset~ fields of _fields_ are insufficient to identify a unique instance of _type_ in the calendar (e.g., when at least one field in each combination capable of determining some part of its data is ~unset~) or a *RangeError* exception if the fields are sufficient but their values are internally inconsistent within the calendar (e.g., when fields such as [[Month]] and [[MonthCode]] have conflicting non-~unset~ values). For example:</p>
       <ul>
-        <li>If _type_ is ~date~ or ~month-day~ and "day" in the calendar has an interpretation similar to ISO 8601 and _fields_.[[Day]] is ~unset~.</li>
+        <li>If _type_ is either ~date~ or ~month-day~, and "day" in the calendar has an interpretation similar to ISO 8601 and _fields_.[[Day]] is ~unset~.</li>
         <li>If _fields_.[[MonthCode]] identifies a month code that is not valid in any year of the calendar.</li>
         <li>If _fields_.[[Month]] and _fields_.[[MonthCode]] are both ~unset~ or neither value is ~unset~ but they do not identify the same month.</li>
         <li>If _type_ is ~month-day~ and _fields_.[[MonthCode]] is ~unset~ and a specific year cannot be determined from _fields_.</li>
@@ -1247,9 +1247,9 @@ <h1>
       <emu-alg>
         1. If _calendar_ is *"iso8601"*, then
           1. Let _needsYear_ be *false*.
-          1. If _type_ is ~date~ or _type_ is ~year-month~, set _needsYear_ to *true*.
+          1. If _type_ is either ~date~ or ~year-month~, set _needsYear_ to *true*.
           1. Let _needsDay_ be *false*.
-          1. If _type_ is ~date~ or _type_ is ~month-day~, set _needsDay_ to *true*.
+          1. If _type_ is either ~date~ or ~month-day~, set _needsDay_ to *true*.
           1. If _needsYear_ is *true* and _fields_.[[Year]] is ~unset~, throw a *TypeError* exception.
           1. If _needsDay_ is *true* and _fields_.[[Day]] is ~unset~, throw a *TypeError* exception.
           1. If _fields_.[[Month]] is ~unset~ and _fields_.[[MonthCode]] is ~unset~, throw a *TypeError* exception.

spec/duration.html

@@ -94,7 +94,7 @@ <h1>Temporal.Duration.compare ( _one_, _two_ [ , _options_ ] )</h1>
         1. Let _largestUnit2_ be DefaultTemporalLargestUnit(_two_).
         1. Let _duration1_ be ToInternalDurationRecord(_one_).
         1. Let _duration2_ be ToInternalDurationRecord(_two_).
-        1. If _zonedRelativeTo_ is not *undefined*, and either TemporalUnitCategory(_largestUnit1_) or TemporalUnitCategory(_largestUnit2_) is ~date~, then
+        1. If _zonedRelativeTo_ is not *undefined*, and TemporalUnitCategory(_largestUnit1_) is ~date~ or TemporalUnitCategory(_largestUnit2_) is ~date~, then
           1. Let _timeZone_ be _zonedRelativeTo_.[[TimeZone]].
           1. Let _calendar_ be _zonedRelativeTo_.[[Calendar]].
           1. Let _after1_ be ? AddZonedDateTime(_zonedRelativeTo_.[[EpochNanoseconds]], _timeZone_, _calendar_, _duration1_, ~constrain~).
@@ -445,7 +445,7 @@ <h1>Temporal.Duration.prototype.round ( _roundTo_ )</h1>
           1. Let _targetDateTime_ be CombineISODateAndTimeRecord(_targetDate_, _targetTime_).
           1. Set _internalDuration_ to ? DifferencePlainDateTimeWithRounding(_isoDateTime_, _targetDateTime_, _calendar_, _largestUnit_, _roundingIncrement_, _smallestUnit_, _roundingMode_).
           1. Return ? TemporalDurationFromInternal(_internalDuration_, _largestUnit_).
-        1. If IsCalendarUnit(_existingLargestUnit_) is *true*, or IsCalendarUnit(_largestUnit_) is *true*, throw a *RangeError* exception.
+        1. If IsCalendarUnit(_existingLargestUnit_) is *true* or IsCalendarUnit(_largestUnit_) is *true*, throw a *RangeError* exception.
         1. Assert: IsCalendarUnit(_smallestUnit_) is *false*.
         1. Let _internalDuration_ be ToInternalDurationRecordWith24HourDays(_duration_).
         1. If _smallestUnit_ is ~day~, then
@@ -497,7 +497,7 @@ <h1>Temporal.Duration.prototype.total ( _totalOf_ )</h1>
           1. Let _total_ be ? DifferencePlainDateTimeWithTotal(_isoDateTime_, _targetDateTime_, _calendar_, _unit_).
         1. Else,
           1. Let _largestUnit_ be DefaultTemporalLargestUnit(_duration_).
-          1. If IsCalendarUnit(_largestUnit_) is *true*, or IsCalendarUnit(_unit_) is *true*, throw a *RangeError* exception.
+          1. If IsCalendarUnit(_largestUnit_) is *true* or IsCalendarUnit(_unit_) is *true*, throw a *RangeError* exception.
           1. Let _internalDuration_ be ToInternalDurationRecordWith24HourDays(_duration_).
           1. Let _total_ be TotalTimeDuration(_internalDuration_.[[Time]], _unit_).
         1. Return 𝔽(_total_).
@@ -516,7 +516,7 @@ <h1>Temporal.Duration.prototype.toString ( [ _options_ ] )</h1>
         1. Let _roundingMode_ be ? GetRoundingModeOption(_resolvedOptions_, ~trunc~).
         1. Let _smallestUnit_ be ? GetTemporalUnitValuedOption(_resolvedOptions_, *"smallestUnit"*, ~unset~).
         1. Perform ? ValidateTemporalUnitValue(_smallestUnit_, ~time~).
-        1. If _smallestUnit_ is ~hour~ or ~minute~, throw a *RangeError* exception.
+        1. If _smallestUnit_ is either ~hour~ or ~minute~, throw a *RangeError* exception.
         1. Let _precision_ be ToSecondsStringPrecisionRecord(_smallestUnit_, _digits_).
         1. If _precision_.[[Unit]] is ~nanosecond~ and _precision_.[[Increment]] = 1, then
           1. Return TemporalDurationToString(_duration_, _precision_.[[Precision]]).
@@ -1943,7 +1943,7 @@ <h1>
         1. If _duration_.[[Minutes]] ≠ 0, then
           1. Set _timePart_ to the string concatenation of _timePart_, abs(_duration_.[[Minutes]]) formatted as a decimal number, and the code unit 0x004D (LATIN CAPITAL LETTER M).
         1. Let _zeroMinutesAndHigher_ be *false*.
-        1. If DefaultTemporalLargestUnit(_duration_) is ~second~, ~millisecond~, ~microsecond~, or ~nanosecond~, set _zeroMinutesAndHigher_ to *true*.
+        1. If DefaultTemporalLargestUnit(_duration_) is one of ~second~, ~millisecond~, ~microsecond~, or ~nanosecond~, set _zeroMinutesAndHigher_ to *true*.
         1. Let _secondsDuration_ be TimeDurationFromComponents(0, 0, _duration_.[[Seconds]], _duration_.[[Milliseconds]], _duration_.[[Microseconds]], _duration_.[[Nanoseconds]]).
         1. If _secondsDuration_ ≠ 0, or _zeroMinutesAndHigher_ is *true*, or _precision_ is not ~auto~, then
           1. Let _secondsPart_ be abs(truncate(_secondsDuration_ / 10<sup>9</sup>)) formatted as a decimal number.

spec/intl.html

@@ -616,7 +616,7 @@ <h1>
             1. Let _formatOptions_ be a new Record.
             1. If _required_ is one of ~date~, ~year-month~, or ~any~, then
               1. Set _formatOptions_.[[era]] to _options_.[[era]].
-            1. If _required_ is ~time~ or ~any~, then
+            1. If _required_ is either ~time~ or ~any~, then
               1. Set _formatOptions_.[[hourCycle]] to _options_.[[hourCycle]].
           1. Let _anyPresent_ be *false*.
           1. For each property name _prop_ of « *"weekday"*, *"year"*, *"month"*, *"day"*, *"dayPeriod"*, *"hour"*, *"minute"*, *"second"*, *"fractionalSecondDigits"* », do
@@ -1099,7 +1099,7 @@ <h1>
         <dl class="header">
         </dl>
         <emu-alg>
-          1. If _temporalDate_.[[Calendar]] is not _dateTimeFormat_.[[Calendar]] or *"iso8601"*, throw a *RangeError* exception.
+          1. If _temporalDate_.[[Calendar]] is not either _dateTimeFormat_.[[Calendar]] or *"iso8601"*, throw a *RangeError* exception.
           1. Let _isoDateTime_ be CombineISODateAndTimeRecord(_temporalDate_.[[ISODate]], NoonTimeRecord()).
           1. Let _epochNs_ be GetUTCEpochNanoseconds(_isoDateTime_).
           1. Let _format_ be _dateTimeFormat_.[[TemporalPlainDateFormat]].

spec/plaintime.html

@@ -882,7 +882,7 @@ <h1>
         <dd>It rounds a time to the given increment.</dd>
       </dl>
       <emu-alg>
-        1. If _unit_ is ~day~ or ~hour~, then
+        1. If _unit_ is either ~day~ or ~hour~, then
           1. Let _quantity_ be ((((_time_.[[Hour]] × 60 + _time_.[[Minute]]) × 60 + _time_.[[Second]]) × 1000 + _time_.[[Millisecond]]) × 1000 + _time_.[[Microsecond]]) × 1000 + _time_.[[Nanosecond]].
         1. Else if _unit_ is ~minute~, then
           1. Let _quantity_ be (((_time_.[[Minute]] × 60 + _time_.[[Second]]) × 1000 + _time_.[[Millisecond]]) × 1000 + _time_.[[Microsecond]]) × 1000 + _time_.[[Nanosecond]].

spec/timezone.html

@@ -299,7 +299,7 @@ <h1>
         1. If _n_ = 1, then
           1. Return the sole element of _possibleEpochNs_.
         1. If _n_ ≠ 0, then
-          1. If _disambiguation_ is ~earlier~ or ~compatible~, then
+          1. If _disambiguation_ is either ~earlier~ or ~compatible~, then
             1. Return _possibleEpochNs_[0].
           1. If _disambiguation_ is ~later~, then
             1. Return _possibleEpochNs_[_n_ - 1].