graphql-dotnet: Type comparison appears to be wrong in InputObjectGraphType

InputObjectGraphType is defined as:

    public class InputObjectGraphType<TSourceType> : ComplexGraphType<TSourceType>, IInputObjectGraphType
    {
        public override FieldType AddField(FieldType fieldType)
        {
            if (fieldType.Type == typeof(ObjectGraphType))
            {
                throw new ArgumentException("InputObjectGraphType cannot have fields containing a ObjectGraphType.", nameof(fieldType.Type));
            }

            return base.AddField(fieldType);
        }
    }

It would appear that this line of code:

if (fieldType.Type == typeof(ObjectGraphType))

should have been written as:

if ((fieldType.Type != null && typeof(ObjectGraphType).IsAssignableFrom(fieldType.Type)) || ((fieldType.ResolvedType as ObjectGraphType) != null))

Is that correct? If so, I can submit a pull request