microsoft / microsoft/typespec
adding string to end of union used for content-type header results in error
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Description
Link to repro in playground [[here](https://azure.github.io/typespec-azure/playground?c=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%2FFHsRgIMkTOiBzdHJpbmfEGn3kAIfnAjtlZChT5gCRQXBp5wHdcykKbmFtZXNwYWPoAJXEY3RyeeQByWRvYygiUmVwcmVzZW50cyB0aPEAuiBBUEkgx2EgdG8gdXNlIGZvciByZXF1ZXN0cy4iKQplbnVtINJ75QC35AItRGVwZW5kZW5jeSjrAlDIJy52MV8wX1ByZXZpZXdfMinENeUAmfUBSiAyMDIxLTEwIMc%2FIsQwVsQVXzEwOiAixx8iLArffd992X0y1H0yyX3EH999333cfTMtMDctMDHoAIAuIFRoaXMgaeYBuucCp%2BgBruQBmuYAnjNfMDdfMDHmAKHHQ%2BQCkgoKLy8gTW9kZWxzIC%2FTAQoKdW7kAffmAIlDb250ZW505AOaVmFsdWXnAeBhZGT1Anku6AEY5ACGY3VzdG9tQmluYXJ5OuQEE%2BQD2eUDxy9vY3RldC1zdHJlYW3nATnfU8xTOiAidGV4dC9wbGFpbjsgY2hhcnNldD11dGYtOMZOYXZyb89zanNvbjsgc2VyaWFs5wROPUF2cm%2Fff81%2FxETfV8RXSnNvbt9XxVfnAaPEWnByb3RvYnVm6ADbdm5kLm1zLsgXxk7oBAJ96APGVGhlIOQEtWVudOUFTeUDpWdpdmVuIHPlAb8uIEVhY2jHDcYjaGFzIGFuIGFzc29jaWF0ZWTIQi3EH%2BQCQG3kAh3yAgDmAfrfeMh45QKHQOYGDygix0YtxEfFGsc9xBA60mrmAmo76gDoxxwgb2blAvTKZPMAq%2BYAp2JvZHnpAK9T5QE4IHLoBPTlAaYgKFVURi04KdJV6QCfOiBieXTtAIlI5QDRc%2BUA8G1ldGFkYXRhxEFh9wCUyDDqATtVUkwgbOcHL8Q6xjgsIGlkZW50aWZpZWQgYnnHFiBncm91cCzIDuQF1CwgYW5k7gPt6QFm6AeGxRbIZOgGODvlAo%2FnBfxmZXJlbmNlcyDkCFppZmljyGNpbiBy6AR66QZDz2fmANotSWTFF8Y5SWTTaP8A6%2B4A60lE2Gct7QDYyHDIFf8A4OsBSNZgR8QbLU5hbeYCmcYxxRXEFN9e6gGY1l3PV9dS5wQU6AKJcmV0dXJuZWT2A0vHWuwGjMYoxxI6IGludDMy6wK0T2JqZWN0IHJlY2VpdmVkIGZyb23HaecB6uQC72Fp5AoUx0zqAaNy5QfsQHJlc291cmNlKCIk6wEicy%2FHDnPvAvdJZOYC8mtleSgiaeYCKecDi8ZgSUQgdGhhdCB1bmlxdWVsecpxc%2BkDTOQCje0Ap%2FACkXZpc2liaWxpdHkoInJlYcZnaesCiuYG7E9wZXLlAiv4BvBpbnRlcmbqCSzLMeUAxnJvdXRlKCLoAO3vAPsve2lkfcV7QGdldAogIGdldMZIQnlJZOQHp%2BsIBUZvdW5kxlwuyWc85Qnp1yZJdGVtS2V5c09mPMZWSWQ%2B5gqST2tSZXNwb25zZSAm7wRvyBDoBRPPEOQFZAogID7kASI%3D&e=%40azure-tools%2Ftypespec-autorest&options=%7B%7D)].
In SchemaRegistry, we want to the content type header to be a union of values. This does not compile when `string` is added to the end of the union, and fails with:
```
contentType parameter must be a string literal or union of string literals
```
It works when `string;` on line 66 of the playground link above is removed. However, it should work when string is added to the end. It also works when the header is renamed to something else, so it seems to be a bug with using the `"Content-Type"` header specifically.
May be related to #2727
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Assessment
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