The special character ~ doesn't need to be converted into URL

When the character ~ appers in the URL, zotero exports the BIB entry using {\textasciitilde} for that character. When you cite the item from the .tex file, and use the ieeetran bibliographystyle, the rendered bibitem shows the latex code {\textasciitilde} rather than the ~ character.

In the URL, no character should be transformed when exported to .bib

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