minor fixes

Pilz.Configuration/SettingsValueOption.cs

@@ -1,4 +1,5 @@
 using Newtonsoft.Json;
+using System;
 
 namespace Pilz.Configuration;
 
@@ -17,7 +18,7 @@ public class SettingsValueOption<T> : ISettingsValueOptionValueAccessor where T
 
     public SettingsValueOption(T value)
     {
-        this.value = DefaultValue = value;
+        DefaultValue = value;
     }
 
     public virtual T Value
@@ -34,7 +35,13 @@ public class SettingsValueOption<T> : ISettingsValueOptionValueAccessor where T
     object ISettingsValueOptionValueAccessor.ValueRaw
     {
         get => value;
-        set => this.value = (T?)(T)value;
+        set
+        {
+            if (value is not null)
+                this.value = Convert.ChangeType(value, typeof(T)) as T?;
+            else
+                this.value = null;
+        }
     }
 
     public virtual void Reset()