Missing test coverage for req.is() with an array argument

[webdevelopersrinu]

req.is() is documented to accept either a string or an array of types (see the @param {String|Array} types JSDoc in lib/request.js). Passing loose string arguments and single strings is covered by the test suite, but calling req.is() with an actual array — e.g. req.is(['html', 'json']) — has no test.

Running npm run test-cov confirms this: lib/request.js line 273 (the Array.isArray(types) branch) is the only uncovered branch in the file.

I'd like to add test cases for the array form to close this gap. Happy to open a PR.

Coverage output (npm run test-cov):

File	% Stmts	% Branch	% Funcs	% Lines	Uncovered Line #s
express/lib	98.74	96.16	100	99.61
request.js	100	98.07	100	100	273

[krzysdz]

In theory #7112 includes tests for it, but I can't force myself to look at the wall of AI slop in that PR.