def ko_deeper_merge!(source, options = {})
      default_opts = {:knockout_prefix => "--", :preserve_unmergeables => false}
      DeepMerge::deep_merge!(source, self, default_opts.merge(options))
    end
def ko_deeper_merge!(source, options = {})
      default_opts = {:knockout_prefix => "--", :preserve_unmergeables => false}
      DeepMerge::deep_merge!(source, self, default_opts.merge(options))
    end
ko_hash_merge! will merge and knockout elements prefixed with DEFAULT_FIELD_KNOCKOUT_PREFIX