Write failing test for Unicode highlighting

[#62434202 #62433730]
Unpack with the right encoding

[Delivers #62434202 #62433730]
Add failing test for weird code

[#62454210]
Fix the failing test

[#62454210]
Escape, yet again, some gorram backslashes

[Delivers #62454210]
[#62454210]

* weird-code-62454210:
  Escape, yet again, some gorram backslashes
  Fix the failing test
  Add failing test for weird code
Issue pull request for branch unicode-highlight-cache-62434202-62433730

[Delivers #62454210](https://www.pivotaltracker.com/story/show/62454210)
[Delivers #62434202](https://www.pivotaltracker.com/story/show/62434202)
[Delivers #62433730](https://www.pivotaltracker.com/story/show/62433730)
[Delivers #62358298](https://www.pivotaltracker.com/story/show/62358298)
[Delivers #62352812](https://www.pivotaltracker.com/story/show/62352812)
Merge pull request #87 from softcover/unicode-highlight-cache-62434202-62433730

Unicode highlight cache 62434202 62433730