RangeFacetFor gives this error for any field defined as Decimal but works fine with Int and doubles. I am wondering is there any way to work with the decimals. Is it a bug?

We get following error "Cannot create range facet for TestDecimal. Range facets can only be created for numerical types and their nullable counterparts as well as dates."

public class BookProduct : ProductContent

 {

[Display(

  Name = "RRP",

  Description = "The RRP for the book.")]

public virtual int TestInt { get; set; }

[Display(

  Name = "RRP",

  Description = "The RRP for the book.")]

public virtual decimal TestDecimal { get; set; }

}

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var productContents3 = SearchClient.Instance.Search()

                         .RangeFacetFor(x => x.TestInt, priceRanges.ToArray())

                         .GetContentResult();

var productContents2 = SearchClient.Instance.Search()

                         .RangeFacetFor(x => x.TestDecimal, priceRanges.ToArray())

                        .GetContentResult(); 

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