Don't crash when using Infinity or NaN as a key in a map (#1073)

Closes #3126

CHANGELOG.md

@@ -3,6 +3,8 @@
 * **Potentially breaking bug fix:** `meta.load-css()` now correctly uses the
   name `$url` for its first argument, rather than `$module`.
 
+* Don't crash when using `Infinity` or `NaN` as a key in a map.
+
 * Emit a proper parse error for a `=` with no right-hand side in a function.
 
 ## 1.27.0

lib/src/util/number.dart

@@ -19,7 +19,9 @@ bool fuzzyEquals(num number1, num number2) =>
 final _inverseEpsilon = 1 / epsilon;
 
 /// Returns a hash code for [number] that matches [fuzzyEquals].
-int fuzzyHashCode(num number) => (number * _inverseEpsilon).round().hashCode;
+int fuzzyHashCode(num number) => number.isInfinite || number.isNaN
+    ? number.hashCode
+    : (number * _inverseEpsilon).round().hashCode;
 
 /// Returns whether [number1] is less than [number2], and not [fuzzyEquals].
 bool fuzzyLessThan(num number1, num number2) =>