Refined deserialization fixup.

src/Runner.Worker/IssueMatcher.cs

@@ -24,7 +24,7 @@ namespace GitHub.Runner.Worker
 
             // Close-over the incoming IEnumerable to force immediate evaluation.
             var empty = Enumerable.Empty<KeyValuePair<string, string>>();
-            this.Data = new Dictionary<string, string>(data ?? empty);
+            this.Data = new Dictionary<string, string>(data ?? empty, StringComparer.OrdinalIgnoreCase);
         }
 
         public readonly string Category;

src/Sdk/DTWebApi/WebApi/Issue.cs

@@ -25,7 +25,6 @@ namespace GitHub.DistributedTask.WebApi
 
         private Issue(Issue original)
         {
-            // DataContractSerializer bypasses all constructor logic and inline initialization!
             this.EnsureInitialized();
             if (original != null)
             {
@@ -107,6 +106,11 @@ namespace GitHub.DistributedTask.WebApi
 
         private IDictionary<string, string> m_data;
 
+        /// <summary>
+        /// DataContractSerializer bypasses all constructor logic and inline initialization!
+        /// This method takes the place of a workhorse constructor for baseline initialization.
+        /// The expectation is for this logic to be accessible to constructors and also to the OnDeserialized helper.
+        /// </summary>
         private void EnsureInitialized()
         {
             m_data = m_data ?? new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);