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`10.1093/<zwsp>oso/<zwsp>` is exactly sixteen bytes, which is the length of `https://doi.org/`, so testing that prefix against it sliced into the middle of the third zero-width space and brought the process down. Found by running citefind over the corpus: the DOI is printed that way in a real book, because the typesetter marked where the line could break. Both prefix tests — DOI and arXiv — now ask for the head rather than cutting one, so a byte length that is not a character boundary is an answer of no rather than a panic. And an invisible character is not part of an identifier. Zero-width spaces, joiners, the soft hyphen, a byte-order mark left at the front of a fragment: text out of a PDF or an EPUB is full of them, they cannot be seen, and a DOI carrying one does not resolve. They are dropped before anything is read.