Tracking issue for debug_map_key_value

[KodrAus]

This is a tracking issue for debug_map_key_value (rust-lang/rfcs#2696)

Steps:

• Implement the RFC (Add key and value methods to DebugMap #60458)
• Adjust documentation (see instructions on rustc-guide)
• Stabilization PR (see instructions on rustc-guide) (Stabilize the debug_map_key_value feature #68200)

Unresolved questions:

[KodrAus]

So I’m using this feature to provide an adapter between serde::Serialize and fmt::Debug that naturally preserves formatting flags and stays aligned with any changes to std::fmt.

[crlf0710]

Already implemented and stablized. Closing.