More explicit/implicit param mismatch warnings.

      ex_len = explicit.length

      im_len = implicit.length

      if ex_len == 0 || im_len == 0

        # Skip

      elsif ex_len < im_len

        # Warn when less parameters documented than found from code.

      if ex_len < im_len && ex_len > 0

        JsDuck::Logger.warn(:param_count, "Detected #{im_len} params, but only #{ex_len} documented.", file[:filename], file[:linenr])

      elsif ex_len > im_len

        # Warn when more parameters documented than found from code.

        JsDuck::Logger.warn(:param_count, "Detected #{im_len} params, but #{ex_len} documented.", file[:filename], file[:linenr])

      elsif implicit.map {|p| p[:name] } != explicit.map {|p| p[:name] }

        # Warn when parameter names don't match up.

        ex_names = explicit.map {|p| p[:name] }

        im_names = implicit.map {|p| p[:name] }

        str = ex_names.zip(im_names).map {|p| ex, im = p; ex == im ? ex : (ex||"")+"/"+(im||"") }.join(", ")

        JsDuck::Logger.warn(:param_count, "Documented and auto-detected params don't match: #{str}", file[:filename], file[:linenr])

      end

      # Override implicit parameters with explicit ones