def expand_param(key, value)
      param = uri_escape(key.to_s).gsub('%3D', '=') # handle :"updated_at=>" or :"person_id!=" parameters
      param << '=' unless key['=']
      param << typecast(value)
      param
    end
def expand_param(key, value)
      param = uri_escape(key.to_s).gsub('%3D', '=') # handle :"updated_at=>" or :"person_id!=" parameters
      param << '=' unless key['=']
      param << typecast(value)
      param
    end
Expand one parameter, e.g. (:"created_at=>", DateTime.now) to "created_at=%3E22011-12-16T12:24:41%2B01:00"