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An Express route keeps its named handler when a middleware before it
holds an arrow function, like rateLimit({ keyGenerator: (req) => req.ip })
or (req, res, next) => next(). Only the last argument decides whether
the handler is inline, and strings, regex literals and type arguments
no longer end an argument or a body early. The Express, route and
framework suites pass (757 tests); on express itself three named
handlers gain their link.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>