fix(logging): Account for nullable value types

This commit updates logging to handle nullable value types and parameters.

The following changes were made:
- Updated the Value record to use '!' instead of '?' for nullability.
- Added '!' to the default Value.
- Added '!= null' checks to conditional assignment.
- Removed unnecessary nullable-disable compiler directives.

Utilities.cs

@@ -133,7 +133,8 @@ namespace lib
 			}
 			else
 			{
-				log.debug( $"{path} already exists." );
+				var cwd = Directory.GetCurrentDirectory();
+				log.debug( $"Dir {path}/ already exists. {cwd}" );
 			}
 
 		}

ar/ArithmeticDecoder.cs

@@ -1,7 +1,7 @@
-/* 
+/*
  * Reference arithmetic coding
  * Copyright (c) Project Nayuki
- * 
+ *
  * https://www.nayuki.io/page/reference-arithmetic-coding
  * https://github.com/nayuki/Reference-arithmetic-coding
  */
@@ -43,7 +43,7 @@ public sealed class ArithmeticDecoder : ArithmeticCoderBase
 		code = 0;
 		for (int i = 0; i < numStateBits; i++)
 		{
-			code = code << 1 | readCodeBit();
+			code = code << 1 | (long)readCodeBit();
 		}
 	}
 
@@ -123,7 +123,7 @@ public sealed class ArithmeticDecoder : ArithmeticCoderBase
 //ORIGINAL LINE: protected void shift() throws java.io.IOException
 	protected internal override void shift()
 	{
-		code = ((code << 1) & stateMask) | readCodeBit();
+		code = ((code << 1) & stateMask) | (long)readCodeBit();
 	}
 
 
@@ -131,7 +131,7 @@ public sealed class ArithmeticDecoder : ArithmeticCoderBase
 //ORIGINAL LINE: protected void underflow() throws java.io.IOException
 	protected internal override void underflow()
 	{
-		code = (code & halfRange) | ((code << 1) & ((long)((ulong)stateMask >> 1))) | readCodeBit();
+		code = (code & halfRange) | ((code << 1) & ((long)((ulong)stateMask >> 1))) | (long)readCodeBit();
 	}
 
 

imm/Imm.cs

@@ -97,7 +97,7 @@ public record class Versioned<T> : Imm
 	where T : Versioned<T>
 {
 
-	public delegate void ChangeDelegate( T old, T next );
+	public delegate void ChangeDelegate( T? old, T next );
 
 	public record class MetaData : Meta
 	{
@@ -138,7 +138,7 @@ public record class Versioned<T> : Imm
 
 	[lib.Dont]
 	[DebuggerBrowsable(DebuggerBrowsableState.Never)]
-	public ChangeDelegate OnChange = (old, cur) => {};
+	public ChangeDelegate OnChange = (T? old,T cur) => {};
 
 	/*
 	public void AddOnChange( ChangeDelegate fn,

logging/Log.cs

@@ -34,7 +34,7 @@ N O T  D O I N G :
 
 public record struct Value<T>( T _val, string _exp = "" )
 {
-	public static T Default = default;
+	public static T Default = default!;
 
 	public static implicit operator T( Value<T> v )
 	{

prof/Program.cs

@@ -12,7 +12,7 @@ namespace Tracing
 	{
 
 
-		static public async Task<int> CreateTracingSession( bool noSampling, bool sortBySize, int topTypesLimit )
+		static public int CreateTracingSession( bool noSampling, bool sortBySize, int topTypesLimit )
 		{
 			ShowHeader();
 

res/Resource.cs

@@ -395,7 +395,7 @@ public class Mgr
 			}
 		}
 
-		return actualLoad<T>( filename );
+		//return actualLoad<T>( filename );
 	}
 
 	static object s_loadingLock = new object();