filename of numbers without extension is classified as JavaScript depending on content

<!-- ⚠️⚠️ Do Not Delete This! bug_report_template ⚠️⚠️ --> <!-- Please read our Rules of Conduct: https://opensource.microsoft.com/codeofconduct/ --> <!-- 🕮 Read our guide about submitting issues: https://github.com/microsoft/vscode/wiki/Submitting-Bugs-and-Suggestions --> <!-- 🔎 Search existing issues to avoid creating duplicates. --> <!-- 🧪 Test using the latest Insiders build to see if your issue has already been fixed: https://code.visualstudio.com/insiders/ --> <!-- 💡 Instead of creating your report here, use 'Report Issue' from the 'Help' menu in VS Code to pre-fill useful information. --> <!-- 🔧 Launch with `code --disable-extensions` to check. --> Does this issue occur when all extensions are disabled?: Yes <!-- 🪓 If you answered No above, use 'Help: Start Extension Bisect' from Command Palette to try to identify the cause. --> <!-- 📣 Issues caused by an extension need to be reported directly to the extension publisher. The 'Help > Report Issue' dialog can assist with this. --> - VS Code Version: Version: 1.67.0-insider (user setup) Commit: a7a7f209ade96c516ce3cd9b330aa8c3db816223 Date: 2022-04-14T05:15:18.304Z - OS Version: Windows 8.1 Steps to Reproduce: 1. Create a file named `007` with the content ``` foobar: ['foobar'] ``` 2. All file icons are the text icon and status bar is `Plain Text` 3. Add `,''` so the file now looks like ``` foobar: ['foobar',''] ``` 4. Now all file icons are replaced with `JS` icon except the `OPEN EDITORS` view (still text icon) and status bar is `JavaScript`. Also now the bracket pair colorization is enabled. 5. Remove `,''` 6. It stays JavaScript 7. Save and Close the file 8. Open the file 9. Now the explorer icon changes back to text icon and all is the same as in step 2 The languageID is determined by the file extension and should be PlainText if no file extension given. But the languageID can change after opening depending on the content. It does not happen for any other filename but `numbers only`. I tried …