Compile with -Wsign-compare flag #8149
Description
🚀 The feature, motivation and pitch
Follow up to #8016
For gcc9, it is failing with sign-compare errors (https://gist.github.com/mergennachin/af7abbdaf24ac5c63ee40284c04aee61)
For now, I disabled that but we should make sure to clean those errors
Alternatives
No response
Additional context
No response
RFC (Optional)
No response