/// <summary>
/// Implements adding a new method to this multimethod
/// </summary>
/// <param name="dispatchVal">The discriminator value for this method.</param>
/// <param name="method">The method code.</param>
/// <returns>This multifunction.</returns>
MultiFn addMethodImpl(object dispatchVal, IFn method)
{
_methodTable = MethodTable.assoc(dispatchVal, method);
ResetCache();
return(this);
}
