Newlib Issue list ver 4.3.0

[mannu1994]

Dear Team / Maintainers,

I am currently working with Newlib version 4.3.0 and would like to understand if there are any known issues or defects in this release excluding security vulnerabilities.

Specifically, I am interested in:

1. Functional bugs
2. Performance-related concerns
3. Compatibility issues
4. Deprecated features or unstable APIs
   If there is any changelog, bug tracker, or discussion thread that highlights such points, kindly share the reference.

Thank you for your support.