Remove PackageComparer, it's not needed

src/DependencyGraph.cs

@@ -9,8 +9,8 @@ namespace Chisel;
 internal sealed class DependencyGraph
 {
     private readonly HashSet<Package> _roots;
-    private readonly Dictionary<Package, HashSet<Package>> _graph = new(PackageComparer.Instance);
-    private readonly Dictionary<Package, HashSet<Package>> _reverseGraph = new(PackageComparer.Instance);
+    private readonly Dictionary<Package, HashSet<Package>> _graph = new();
+    private readonly Dictionary<Package, HashSet<Package>> _reverseGraph = new();
 
     private static Package CreatePackage(LockFileTargetLibrary library)
     {
@@ -41,7 +41,7 @@ public DependencyGraph(string projectAssetsFile, string tfm, string rid)
         };
         var packages = target.Libraries.ToDictionary(e => e.Name ?? "", CreatePackage, StringComparer.OrdinalIgnoreCase);
 
-        _roots = new HashSet<Package>(framework.Dependencies.Select(e => packages[e.Name]), PackageComparer.Instance);
+        _roots = new HashSet<Package>(framework.Dependencies.Select(e => packages[e.Name]));
 
         foreach (var package in packages.Values)
         {
@@ -70,7 +70,7 @@ public DependencyGraph(string projectAssetsFile, string tfm, string rid)
     {
         var notFound = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
         var removedRoots = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
-        var dependencies = new HashSet<Package>(PackageComparer.Instance);
+        var dependencies = new HashSet<Package>();
         foreach (var packageName in packages.Distinct())
         {
             var packageDependency = _reverseGraph.Keys.SingleOrDefault(e => e.Name.Equals(packageName, StringComparison.OrdinalIgnoreCase));

src/Package.cs

@@ -24,9 +24,14 @@ public Package(string name, string version, IReadOnlyCollection<string> dependen
 
     public override string ToString() => Name;
 
-    public bool Equals(Package? other) => PackageComparer.Instance.Equals(this, other);
+    public bool Equals(Package? other)
+    {
+        if (ReferenceEquals(null, other)) return false;
+        if (ReferenceEquals(this, other)) return true;
+        return Name.Equals(other.Name, StringComparison.OrdinalIgnoreCase);
+    }
 
-    public override bool Equals(object? other) => PackageComparer.Instance.Equals(this, other as Package);
+    public override bool Equals(object? obj) => ReferenceEquals(this, obj) || obj is Package other && Equals(other);
 
-    public override int GetHashCode() => PackageComparer.Instance.GetHashCode(this);
+    public override int GetHashCode() => Name.GetHashCode();
 }