.net 8 syntax/perf changes

Solver/ArenaNode.cs

@@ -2,24 +2,16 @@ using System.Runtime.CompilerServices;
 
 namespace Craftimizer.Solver;
 
-public sealed class ArenaNode<T> where T : struct
+public sealed class ArenaNode<T>(in T state, ArenaNode<T>? parent = null) where T : struct
 {
-    public T State;
+    public T State = state;
     public ArenaBuffer<T> Children;
     public NodeScoresBuffer ChildScores;
     public (int arrayIdx, int subIdx) ChildIdx;
-    public readonly ArenaNode<T>? Parent;
+    public readonly ArenaNode<T>? Parent = parent;
 
     public NodeScoresBuffer? ParentScores => Parent?.ChildScores;
 
-    public ArenaNode(in T state, ArenaNode<T>? parent = null)
-    {
-        State = state;
-        Children = new();
-        ChildScores = new();
-        Parent = parent;
-    }
-
     public ArenaNode<T>? ChildAt((int arrayIdx, int subIdx) at) =>
         Children.Data?[at.arrayIdx]?[at.subIdx];
 

Solver/SimulationNode.cs

@@ -7,26 +7,18 @@ using System.Runtime.InteropServices;
 namespace Craftimizer.Solver;
 
 [StructLayout(LayoutKind.Auto)]
-public struct SimulationNode
+public struct SimulationNode(in SimulationState state, ActionType? action, CompletionState completionState, ActionSet actions)
 {
-    public readonly SimulationState State;
-    public readonly ActionType? Action;
-    public readonly CompletionState SimulationCompletionState;
+    public readonly SimulationState State = state;
+    public readonly ActionType? Action = action;
+    public readonly CompletionState SimulationCompletionState = completionState;
 
-    public ActionSet AvailableActions;
+    public ActionSet AvailableActions = actions;
 
     public readonly CompletionState CompletionState => GetCompletionState(SimulationCompletionState, AvailableActions);
 
     public readonly bool IsComplete => CompletionState != CompletionState.Incomplete;
 
-    public SimulationNode(in SimulationState state, ActionType? action, CompletionState completionState, ActionSet actions)
-    {
-        State = state;
-        Action = action;
-        SimulationCompletionState = completionState;
-        AvailableActions = actions;
-    }
-
     public static CompletionState GetCompletionState(CompletionState simCompletionState, ActionSet actions) =>
         actions.IsEmpty && simCompletionState == CompletionState.Incomplete ?
         CompletionState.NoMoreActions :