will_paginate: fails when using :group option

when using the :group option with Rails 1.2.3, ActiveRecord will return an ordered hash which causes a problem with the count statement on line 28 of the file finder.rb. The following error is returned:

undefined method `to_i' for #<activesupport::orderedhash:0x99c4470>

this can be fixed by using the following:

num = count(count_options)

num.class == Fixnum ? num : num.length

unless there's a better way of doing it..

also, the following code on line 27 needs to be merge! and not merge, since merge returns a new hash, rather than modifying it in place, as was intended.

count_options.merge(options.delete(:count)) if options[:count]