Problem with "a.k.a." abbreviation in citeproc titles

[Joseph Reagle <joseph.2011-T1oY19WcHSwdnm+yROfE0A@public.gmane.org>]

I'm not sure if the problem is my data, citeproc, or the CSL. The problem is the awkward casing of "A.k.a." when `--style-csl chicago-fullnote-bibliography.csl`:

Paul Buchheit, “Applied Philosophy, A.k.a. ‘Hacking’,” Web log message, (October 13, 2009), http://paulbuchheit.blogspot.com/2009/10/applied-philosophy-aka-hacking.html.↩


My data:

---
- id: Buchheit2009apk
  type: post-weblog
  genre: Web log message
  abstract: "Developer of Gmail discusses hacking of systems"
  author:
  - family: "Buchheit"
    given: "Paul"
  custom2: "lh.mm"
  issued:
    year: 2009
    month: 10
    day: 13
  title: "Applied philosophy, a.k.a. \'hacking\'"
  URL: "http://paulbuchheit.blogspot.com/2009/10/applied-philosophy-aka-hacking.html"
  accessed:
    year: 2015
    month: 07
    day: 23
...

Should I be somehow escaping punctuated initialisms?

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