I really believe in gender fairness and fluidness in prounouning, and I
get why "they" is always better to use, and that the "one's request"
construction is too tortured. So, I tend to just write everything in
plurals if possible which keeps 'they' but makes the number
grammatically agree.
Yes, I know that the ADT made "they/them used as singular" as 2015 word
of the year. (see
https://en.wikipedia.org/wiki/Word_of_the_year#American_Dialect_Society
so maybe some nun slapped the table too hard with her ruler when made
some plural/singular mistake with a pronoun when I was in grade school,
but I have a compulsive need to change everything to plural when I see
"they" and am editing a document. ;)
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