I wrote this while investigating bug 1896729. It seems it didn't help with those, but helps with other micro-benchmarks (plus it's not a lot of code so seems worth inlining): https://treeherder.mozilla.org/perfherder/comparesubtest?originalProject=try&newProject=try&newRevision=27ba5b2ad99b0e7dc5af443ee21f0f227f9a7589&originalSignature=4765498&newSignature=4765498&framework=1&application=firefox&originalRevision=63f02a17fab2cf51723bc45088c76a5ecde37af9&page=1&showOnlyImportant=1 Differential Revision: https://phabricator.services.mozilla.com/D210876
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<h1><span class="LXRSHORTDESC">managing sequences of characters</span></h1>
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