https://github.com/Pauan/ar/commit/a2c1939936846b665eccf06d0...
Thanks for finding the bug, and the great idea for fixing it.
BTW, I think `(unescape-ats s)` also needs to be treated as the same.
So that it will not fail when atstrings is set.
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https://github.com/Pauan/ar/commit/95f13f757a52a5d07f5467603...