Exception when `NaN` or `Infinity` are used as key to map

[connorskees]

For the following inputs dart-sass will raise an exception,

$a: ((0/0): a);

$a: ((1/0): a);

$a: ((-1/0): a);

Stacktrace

Unexpected exception:
Unsupported operation: Infinity or NaN toInt


dart:core                                                            double.round
package:sass/src/util/number.dart 22:61                              fuzzyHashCode
package:sass/src/value/number.dart 521:23                            SassNumber.hashCode
dart:collection                                                      _LinkedHashMapMixin.containsKey
package:sass/src/visitor/evaluate.dart 2037:15                       _EvaluateVisitor.visitMapExpression
package:sass/src/ast/sass/expression/map.dart 24:56                  MapExpression.accept
package:sass/src/visitor/evaluate.dart 1855:33                       _EvaluateVisitor.visitVariableDeclaration
package:sass/src/ast/sass/statement/variable_declaration.dart 75:15  VariableDeclaration.accept
package:sass/src/visitor/evaluate.dart 862:13                        _EvaluateVisitor.visitStylesheet
package:sass/src/visitor/evaluate.dart 678:7                         _EvaluateVisitor._execute.<fn>
package:sass/src/visitor/evaluate.dart 2700:26                       _EvaluateVisitor._withEnvironment
package:sass/src/visitor/evaluate.dart 648:5                         _EvaluateVisitor._execute
package:sass/src/visitor/evaluate.dart 486:20                        _EvaluateVisitor.run.<fn>
package:sass/src/warn.dart 32:20                                     withWarnCallback.<fn>
dart:async                                                           runZoned
package:sass/src/warn.dart 31:10                                     withWarnCallback
package:sass/src/visitor/evaluate.dart 502:12                        _EvaluateVisitor._withWarnCallback
package:sass/src/visitor/evaluate.dart 473:12                        _EvaluateVisitor.run
package:sass/src/visitor/evaluate.dart 95:10                         evaluate
package:sass/src/compile.dart 134:24                                 _compileStylesheet
package:sass/src/compile.dart 64:10                                  compile
package:sass/src/executable/compile_stylesheet.dart 91:13            compileStylesheet

Related to https://github.com/sass/sass/issues/2892

[nex3]

Blocked on https://github.com/dart-lang/sdk/issues/49033.