`req.getHeaders()` does not return values set using "rawHeaders" array

### Version v24.18.0 ### Platform ```text Darwin MBPM.local 25.5.0 Darwin Kernel Version 25.5.0: Tue Jun 9 22:28:29 PDT 2026; root:xnu-12377.121.10~1/RELEASE_ARM64_T6030 arm64 ``` ### Subsystem http ### What steps will reproduce the bug? Headers set using the [message.rawHeaders](https://nodejs.org/api/http.html#messagerawheaders) format are not available on the request's `getHeaders()` method ```js import { get } from 'node:http' const request = get( 'http://localhost:3000', { headers: ['foo', 'bar', 'baz', 'qux'] }, (res) => { let data = '' res.on('data', (chunk) => { data += chunk }) res.on('end', () => { console.log(data) }) } ) request.on('error', () => {}) console.log(request.getHeaders()) // [Object: null prototype] {} console.log(request.getHeaderNames()) // [] console.log(request.getRawHeaderNames()) // [] console.log(request._header) // GET / HTTP/1.1\r\nfoo: bar\r\nbaz: qux\r\nConnection: keep-alive ``` ### How often does it reproduce? Is there a required condition? Always ### What is the expected behavior? Why is that the expected behavior? One would expect `req.getHeaders()` (and friends) to return a consistent value, whether an object or an array was passed as argument. ### What do you see instead? `req.getHeaders()` appears to be empty when request options are built using an array notation. ### Additional information _No response_