Normative: Re-order operations in GetDifferenceSettings

Author: sffc

spec/abstractops.html

@@ -1872,13 +1872,13 @@ <h1>
     <emu-alg>
       1. NOTE: The following steps read options and perform independent validation in alphabetical order.
       1. Let _largestUnit_ be ? GetTemporalUnitValuedOption(_options_, *"largestUnit"*, ~auto~).
-      1. Perform ? ValidateTemporalUnitValue(_largestUnit_, _unitGroup_).
-      1. If _disallowedUnits_ contains _largestUnit_, throw a *RangeError* exception.
       1. Let _roundingIncrement_ be ? GetRoundingIncrementOption(_options_).
       1. Let _roundingMode_ be ? GetRoundingModeOption(_options_, ~trunc~).
+      1. Let _smallestUnitOrUnset_ be ? GetTemporalUnitValuedOption(_options_, *"smallestUnit"*, ~unset~).
+      1. Perform ? ValidateTemporalUnitValue(_largestUnit_, _unitGroup_).
+      1. If _disallowedUnits_ contains _largestUnit_, throw a *RangeError* exception.
       1. If _operation_ is ~since~, then
         1. Set _roundingMode_ to NegateRoundingMode(_roundingMode_).
-      1. Let _smallestUnitOrUnset_ be ? GetTemporalUnitValuedOption(_options_, *"smallestUnit"*, ~unset~).
       1. Perform ? ValidateTemporalUnitValue(_smallestUnitOrUnset_, _unitGroup_).
       1. If _smallestUnitOrUnset_ is ~unset~, then
         1. Set _smallestUnit_ to _fallbackSmallestUnit_.