Thank you for your response. I now see that I had misunderstood the documentation.
Also, it occurs to me that one can make use of single quotation marks as primary quotes when mentioning a word without using it. Moreover, when italics and double quotation marks are also present, the use of single quotations as primary is necessary. For example:
'GNU' is an acronym for the phrase "GNU's Not Unix!" but GNU is an operating system and not an acronym.
Is it feasible to add an option to treat single quotation marks as primary pairs on export?