OData select query not working in ASP.NET WebAPI beta

I'm playing around with the WebAPI beta, and it seems that selects have no effect on the response of an action returning an IQueryable. Eg:

http://localhost:62689/api/product?$select=Id,Name

Expected:

<Product><Id>1</Id><Name>Product 1</Name></Product>

Actual result:

<Product><Id>1</Id><Name>Product 1</Name><ItemsInStock>6</ItemsInStock><Price>49.99</Price><Created>2012-01-15T00:00:00</Created></Product>

Are there limitations on OData support for WebAPI?

I've tried other queries on this set of data (like top, filter) and they work fine.