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<h3>Syntax adjustments for the !! operator</h3>
<p>The headline improvement is a much improved syntax for the <code>!!</code> operator (pronounced bang-bang). In a way bang-bang is a lie, or a <a href="https://adv-r.hadley.nz/quasiquotation.html#the-polite-fiction-of">polite fiction</a>. It is not a real R operator and only works in tidy evaluation functions. To implement <code>!!</code>, we simply look at the code and reinterpret two consecutive <code>!</code> negations as the unquoting operator. The maj