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I've always thought it was clear-cut, with one style being consistently used in the UK and the other in the US, and that also seems to be what many online style guides claim - which is why this particular case stood out. With dashes (and ellipses) it seems the recommendations are more lenient, as long as you choose one style and stick to it consistently throughout.
Interesting tidbits, and makes sense - there are very few things people or countries can agree on and be consistent about...
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