is this better?

checked_yaml/CHANGELOG.md

@@ -1,4 +1,4 @@
-## 2.0.4-wip
+## 2.0.4
 
 - Require Dart 3.8
 

checked_yaml/lib/checked_yaml.dart

@@ -59,48 +59,42 @@ ParsedYamlException toParsedYamlException(
 }) {
   final yamlMap = exceptionMap ?? exception.map as YamlMap;
 
-  final innerError = exception.innerError;
-
-  if (exception.badKey) {
-    final key = (innerError is UnrecognizedKeysException)
-        ? innerError.unrecognizedKeys.first
-        : exception.key;
-
-    final node =
-        yamlMap.nodes.keys.singleWhere(
-              (k) => (k as YamlScalar).value == key,
-              orElse: () => yamlMap,
-            )
-            as YamlNode;
-    return ParsedYamlException(exception.message!, node, innerError: exception);
-  } else {
-    if (exception.key == null) {
-      return ParsedYamlException(
-        exception.message ?? 'There was an error parsing the map.',
-        yamlMap,
-        innerError: exception,
-      );
-    } else if (!yamlMap.containsKey(exception.key)) {
-      return ParsedYamlException(
-        [
-          'Missing key "${exception.key}".',
-          if (exception.message != null) exception.message!,
-        ].join(' '),
+  return switch (exception) {
+    CheckedFromJsonException(badKey: true, message: final String message) =>
+      () {
+        final innerError = exception.innerError;
+        final key = (innerError is UnrecognizedKeysException)
+            ? innerError.unrecognizedKeys.first
+            : exception.key;
+
+        final node =
+            yamlMap.nodes.keys.singleWhere(
+                  (k) => (k as YamlScalar).value == key,
+                  orElse: () => yamlMap,
+                )
+                as YamlNode;
+        return ParsedYamlException(message, node, innerError: exception);
+      }(),
+    CheckedFromJsonException(key: null) => ParsedYamlException(
+      exception.message ?? 'There was an error parsing the map.',
+      yamlMap,
+      innerError: exception,
+    ),
+    CheckedFromJsonException(key: final key!) when !yamlMap.containsKey(key) =>
+      ParsedYamlException(
+        ['Missing key "$key".', ?exception.message].join(' '),
         yamlMap,
         innerError: exception,
-      );
-    } else {
-      var message = 'Unsupported value for "${exception.key}".';
-      if (exception.message != null) {
-        message = '$message ${exception.message}';
-      }
-      return ParsedYamlException(
-        message,
-        yamlMap.nodes[exception.key] ?? yamlMap,
-        innerError: exception,
-      );
-    }
-  }
+      ),
+    _ => ParsedYamlException(
+      [
+        'Unsupported value for "${exception.key}".',
+        ?exception.message,
+      ].join(' '),
+      yamlMap.nodes[exception.key] ?? yamlMap,
+      innerError: exception,
+    ),
+  };
 }
 
 /// An exception thrown when parsing YAML that contains information about the
@@ -118,12 +112,14 @@ class ParsedYamlException implements Exception {
   /// contains the source error object.
   final Object? innerError;
 
-  ParsedYamlException(String message, YamlNode this.yamlNode, {this.innerError})
-    : // TODO(kevmoo) remove when dart-lang/sdk#50756 is fixed!
-      message = message.replaceAll(" of ' in type cast'", ' in type cast');
+  const ParsedYamlException(
+    this.message,
+    YamlNode this.yamlNode, {
+    this.innerError,
+  });
 
-  factory ParsedYamlException.fromYamlException(YamlException exception) =>
-      _WrappedYamlException(exception);
+  factory ParsedYamlException.fromYamlException(YamlException exception) =
+      _WrappedYamlException;
 
   /// Returns [message] formatted with source information provided by
   /// [yamlNode].
@@ -134,7 +130,7 @@ class ParsedYamlException implements Exception {
 }
 
 class _WrappedYamlException implements ParsedYamlException {
-  _WrappedYamlException(this.innerError);
+  const _WrappedYamlException(this.innerError);
 
   @override
   String? get formattedMessage => innerError.span?.message(innerError.message);
@@ -147,7 +143,4 @@ class _WrappedYamlException implements ParsedYamlException {
 
   @override
   YamlNode? get yamlNode => null;
-
-  @override
-  String toString() => 'ParsedYamlException: $formattedMessage';
 }

checked_yaml/pubspec.yaml

@@ -1,5 +1,5 @@
 name: checked_yaml
-version: 2.0.4-wip
+version: 2.0.4
 
 description: >-
   Generate more helpful exceptions when decoding YAML documents using