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add note regarding hyphen-hyphen => en dash, hyphen-hyphen-hyphen => em dash
As discussed here https://github.com/citation-style-language/csl-evolution/issues/36 processors are expected to convert two hyphens to en dashes and three dashes to em dashes.
There is also this to take into account: https://discourse.citationstyles.org/t/en-dash-subsittution-in-text/1497/9