A warning is now displayed when a file’s contents include hidden Unicode text on github.com. Such text can be interpreted differently than it appears in a user interface. For example, hidden Unicode characters can hide text in a file. This can cause code to appear one way and be interpreted another way, especially by AI.
To review a file for which this warning is displayed, open it in an editor that will display the hidden Unicode characters, like Visual Studio Code which highlights the characters by default. Then, verify that the characters are necessary and not disguising text that will be interpreted or compiled differently than it appears.
For more information, refer to Pillar Security: Rules File Backdoor and Hiding and Finding Text with Unicode Tags.