Attempt to fix AOT compatibility

Author: sakno

src/DotNext/Runtime/BoxedValue.cs

@@ -21,7 +21,7 @@ namespace DotNext.Runtime;
 /// not for <see cref="BoxedValue{T}"/>.
 /// </remarks>
 /// <typeparam name="T">The value type.</typeparam>
-public abstract class BoxedValue<T> // do not add any interfaces or base types
+public class BoxedValue<T> // do not add any interfaces or base types
     where T : struct
 {
     [ExcludeFromCodeCoverage]
@@ -108,13 +108,4 @@ namespace DotNext.Runtime;
     /// <returns>Mutable reference to the boxed value.</returns>
     public static implicit operator ValueReference<T>(BoxedValue<T> boxedValue)
         => new(boxedValue, ref boxedValue.Value);
-
-    /// <inheritdoc />
-    public abstract override bool Equals([NotNullWhen(true)] object? obj);  // abstract to avoid inlining by AOT/JIT
-
-    /// <inheritdoc />
-    public abstract override int GetHashCode(); // abstract to avoid inlining by AOT/JIT
-
-    /// <inheritdoc />
-    public abstract override string ToString(); // abstract to avoid inlining by AOT/JIT
 }