Bug 10134

I'm using the sql tag to pull some numbers out of the database, and our db
driver is returning BigDecimal objects.  I then try to use EL to do arithmetic
operations on these BigDecimal objects, but it rounds everything.  I dug into
Coercion and PrimitiveObject, and if the Number isn't one of a standard couple,
it casts it to an Integer (and thus loses my rounding).

Here's a sample JSP to see the behavior:
<%@ page import="java.math.*" %>
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<%
pageContext.setAttribute("a", new BigDecimal(1.5));
pageContext.setAttribute("b", new BigDecimal(2.25));
%>
a + b = <c:out value="${a + b}" />
<br />
a - b = <c:out value="${a - b}" />