How to represent circa and BCE in yaml?

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

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I've seen a couple of bugs discussing ranges, multiples, negatives (BCE), and circa, but in playing with a minimal example, I can't figure out the correct format. Is there documentation on this?


I can get BCE to work with a negative 'year' integer.

But circa...

```
  issued:
    - year: 161
    - circa: 1
```

 puts a `-` after AD?

```
<li id="fn1" role="doc-endnote"><p>Marcus Aurelius, <em>Meditations</em>, ed. Maxwell Staniforth (London: Penguin Books, 161AD–).<a href="#fnref1" class="footnote-back" role="doc-backlink">↩︎</a></p></li>
```

No idea how to do a range or multiple specification. (I do use 'original-date''year', but chicago-fullnote-bibliography.csl doesn't seem to use that...)




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---
author: Joseph Reagle 
title: "Test"
suppress-bibliography: true
...

test of [@Aurelius2005mns]

---
references:
- id: Aurelius2005mns
  type: book
  publisher-place: "London"
  author:
  - family: "Aurelius"
    given: "Marcus"
  issued:
    - year: 161
    - circa: 1
  editor:
  - family: "Staniforth"
    given: "Maxwell"
  ISBN: "9780143036272"
  publisher: "Penguin Books"
  title: "Meditations"
...