if (type.GetCustomAttribute<InlineArrayAttribute>() is { } inlineAttr)
    {
        Delegate helper = inlineHelper<int, int>;
        MethodInfo helperMethod = helper.Method.GetGenericMethodDefinition().MakeGenericMethod(type, fields.Single().FieldType);
        return helperMethod.Invoke(helper.Target, [o, inlineAttr.Length]);
    }

    TArray inlineHelper<TArray, TField>(TArray array, int length)
    {
        Span<TField> span = MemoryMarshal.CreateSpan(ref Unsafe.As<TArray, TField>(ref array), length);
        for (int i; i < length; i++)
            span[i] = (TField)visit(span[i]);
        return array;
    }

    if (type.GetCustomAttribute<InlineArrayAttribute>() is { } inlineAttr)
    {
        Delegate helper = inlineHelper<int, int>;
        MethodInfo helperMethod = helper.Method.GetGenericMethodDefinition().MakeGenericMethod(type, fields.Single().FieldType);
        return helperMethod.Invoke(helper.Target, [o, inlineAttr.Length]);
    }

    TArray inlineHelper<TArray, TField>(TArray array, int length)
    {
        Span<TField> span = MemoryMarshal.CreateSpan(ref Unsafe.As<TArray, TField>(ref array), length);
        for (int i; i < length; i++)
            span[i] = (TField)visit(span[i]);
        return array;
    }