I am certainly no expert on the subject, but your question intrigued me. I think that OSX is in control of spelling in Reunion. From the Mac Help Center, I found the following:
If you accidentally add a misspelled word to the dictionary, type the misspelling in the Spelling and Grammar window and click Ignore, or Control-click the misspelling and choose Unlearn Spelling from the shortcut menu.
I hope this helps, but again, I don't know for sure.
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