compile_glob

# File activesupport/lib/active_support/file_update_checker.rb, line 117
    def compile_glob(hash)
      hash.freeze # Freeze so changes aren't accidentally pushed
      return if hash.empty?

      globs = hash.map do |key, value|
        "#{escape(key)}/**/*#{compile_ext(value)}"
      end
      "{#{globs.join(",")}}"
    end