 builder to the <code>Parameters</code>-accepting
 function without a change. For example, if the builder defines an <code>int</code> parameter,
 it must be looked up as <code>int</code> and cannot be looked up as <code>long</code>.
 <p>
 Values of primitive types may be looked up either using the primitive type (such as
 <code>int.class</code>), or using the corresponding wrapper type (<code>Integer.class</code>).
 The return value is always of the wrapper type, so that <code>null</code> can be returned
 w