This NIP is not yet in main. Here is an overview of PRs referencing this NIP.
NIP44 encryption standard, revision 3 OPEN @paulmillr
Introduce NIP-44 encryption standard CLOSED @staab
Improvement to CLOSED @earonesty
NIP-43 - Fast Authentication OPEN @arthurfranca
Implement Markdownlint GitHub action OPEN @mariano-perez-rodriguez
Markdown improvements - 04 CLOSED @mariano-perez-rodriguez
Markdown improvements, embelishments, and standardizations CLOSED @mariano-perez-rodriguez
fix grammar and typos MERGED @vivganes
Update all NIPs to include 'depends' and 'mentions' tags OPEN @blakejakopovic
Added NIP-04 metadata leak warning MERGED @bmewj
NIP-04 follow up: use new import in code sample MERGED @sistemd
NIP-04: fix bug in code sample MERGED @sistemd
NIP-04: Minor wording change MERGED @jeffthibault
Avoid using `substr` in NIP-04 example MERGED @sistemd
Fix minor typo MERGED @thebrandonlucas
NIP-04: clarify how shared secret is computed MERGED @jeffthibault
finalize some NIPs we will not change anymore MERGED @fiatjaf