Prefer intervals

Author: jessealama

spec.emu

@@ -96,7 +96,8 @@ location: https://github.com/tc39/proposal-amount/
             1. If _fractionDigits_ is not in the inclusive interval from 0 to 100, throw a *RangeError* exception.
           1. Else if _significantDigits_ is not *undefined*, then
             1. If _significantDigits_ is not an integral Number, throw a *RangeError* exception.
-            1. If _significantDigits_ &lt; *1*<sub>𝔽</sub> or _significantDigits_ > *21*<sub>𝔽</sub>, throw a *RangeError* exception.
+            1. Set _significantDigits_ to ℝ(_significantDigits_).
+            1. If _significantDigits_ is not in the inclusive interval from 1 to 21, throw a *RangeError* exception.
           1. If _unit_ is the empty String, throw a *RangeError* exception.
           1. Return the Record { [[FractionDigits]]: _fractionDigits_, [[RoundingMode]]: _roundingMode_, [[SignificantDigits]]: _significantDigits_, [[Unit]]: _unit_ }.
         </emu-alg>