Cleaner Imm

imm/Imm.cs

@@ -189,7 +189,7 @@ public record class Recorded<T> : Versioned<T>
 			MetaStorage = Meta with
 			{
 				Version = orig.Meta.Version + 1,
-				Reason = reason,
+				Reason = !string.IsNullOrWhiteSpace( reason ) ? reason : next.Meta.Reason,
 
 				ZZOld = orig,
 				MemberName = dbgName,
@@ -227,6 +227,10 @@ public record class Timed<T> : Recorded<T>
 
 	public TimeSpan Since => Meta.TouchedAt - Meta.Old?.Meta.TouchedAt ?? TimeSpan.MaxValue;
 
+	public void CallOnChange()
+	{
+		OnChange( Meta.Old, (T)this );
+	}
 
 	override public T Record(
 													string reason = "",
@@ -250,6 +254,18 @@ public record class Timed<T> : Recorded<T>
 		return Process( ( old ) => next, reason, dbgName, dbgPath, lineNumber, dbgExp );
 	}
 
+	public U ProcessFn<U>( Func<U, U> fn,
+													string reason = "",
+													[CallerMemberName] string dbgName = "",
+													[CallerFilePath] string dbgPath = "",
+													[CallerLineNumber] int lineNumber = 0,
+													[CallerArgumentExpression("next")]
+													string dbgExp = default
+													)
+													where U : T
+	{
+		return (U)ProcessFn( fn, reason, dbgName, dbgPath, lineNumber, dbgExp );
+	}
 
 	override public T Process( Func<T, T> fn,
 													string reason = "",
@@ -259,6 +275,16 @@ public record class Timed<T> : Recorded<T>
 													[CallerArgumentExpression("fn")]
 													string dbgExp = default
 													)
+													=> ProcessFn( fn, reason, dbgName, dbgPath, dbgLine, dbgExp );
+
+	public T ProcessFn( Func<T, T> fn,
+													string reason = "",
+													[CallerMemberName] string dbgName = "",
+													[CallerFilePath] string dbgPath = "",
+													[CallerLineNumber] int dbgLine = 0,
+													[CallerArgumentExpression("fn")]
+													string dbgExp = default
+													)
 	{
 		var orig = ( T )this;
 
@@ -270,7 +296,7 @@ public record class Timed<T> : Recorded<T>
 			{
 				//Versioned
 				Version = orig.Meta.Version + 1,
-				Reason = reason,
+				Reason = !string.IsNullOrWhiteSpace( reason ) ? reason : next.Meta.Reason,
 
 				//Recorded
 				MemberName = dbgName,