Quote:
Originally Posted by charleski
Since some readers don't recognise either form of dash as a word-boundary, I prefer spaced en-dashes to prevent awkward line-breaks.
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Exactly. When I format books for myself, I always add spaces around the dashes for this reason, and because it looks more aesthetically pleasing. No spaces gives it a very 'blocky' look. The rules are guide-lines and not the law, after all.