compile_glob

# File activesupport/lib/active_support/file_update_checker.rb, line 104
    def compile_glob(hash) #:nodoc:
      hash.freeze # Freeze so changes aren't accidently pushed
      return if hash.empty?

      globs = []
      hash.each do |key, value|
        globs << "#{key}/**/*#{compile_ext(value)}"
      end
      "{#{globs.join(",")}}"
    end