Create 2025-01-31-racket-v8-16.md

[spdegabrielle]

@jbclements is this right?

After this is done, the release manager changes the DRAFT tag into the release-management tag, to allow simultaneous release of the blog post and the download link.

from wiki https://github.com/racket/racket/wiki/Release-process#instructions-for-communications-manager-and-community-liaison

[spdegabrielle]

@jbclements

Excited!

Version 8.16

• Add treelist-filter, treelist-index-of, treelist-flatten,
  treelist-append*, and sequence->treelist in racket/treelist,
  repair treelist-set on non-leftwise-dense subtrees,
  and change treelist/c to never lazy by default
• Add mutable-treelist-prepend! in racket/mutable-treelist
• Change (mutable) treelists to support serialization
• Add flbit-field to racket/flonum
• Add \X in pregexp to match a grapheme cluster character sequence
• Improve ffi/unsafe layers to speed up ptr-ref and ptr-set!
• Add port-file-stat
• Add pipe-port?
• Add open-input-nowhere to racket/port
• Improve read-bytes for large requests through custom input ports
• CS: repair custom-port polling by peek-bytes-avail*!
• Allow make-parameter as cross-phase persistent
• CS: repair simplify-path for a link that needs simplification
• Add read-json* and write-json* in (submod json for-extension)
• Improve XML reader performance
  -Add error-syntax->name-handler
• Add racket/serialize-structs
• BC: upgrade to libffi 3.4.6