I wrote "a núll" and it told me I had a typo. How important is it, orthographically, to write it as "a n-úll" as opposed to "a núll" or "a n'úll"?
Is it roughly akin to "color" vs "colour" where it's a regional thing? Is it roughly akin to "Brian" vs "Bryan" where there really is no standard? Or is it a proper error and Duo is just being lenient?
Is there a difference in prononciation with "an úll" (the apple) and "A n úll" (their apple) ?
Is there a glottal stop in the pronunciation where the dash is?
From what I've gathered in other discussions, it should not be there, no. Apparently the person they got to read the Irish lessons isn't that much better than the computer voice used in the other languages.
I think of the audio as a gift, an important aid, and a thousand times better than the written words alone. I add my hope that DuoLingo soon will add more audio to the Irish lessons.