This issue tracks the release notes text for #129559. - [ ] Issue is nominated for the responsible team (and T-release nomination is removed). - [ ] Proposed text is drafted by team responsible for underlying change. - [ ] Issue is nominated for release team review of clarity for wider audience. - [ ] Release team includes text in release notes/blog posts. Release notes text: The section title will be de-duplicated by the release team with other release notes issues. Prefer to use the standard titles from [previous releases](https://doc.rust-lang.org/nightly/releases.html). More than one section can be included if needed. ```markdown # Language - [Document NaN bit patterns guarantees](https://github.com/rust-lang/rust/pull/129559) ``` Release blog section (if any, leave blank if no section is expected): ```markdown ```