This NIP is not yet in main. Here is an overview of PRs referencing this NIP. 
NIP-46, NIP-49, NIP-65: fix typos MERGED @AsaiToshiya
NIP-49 test vector for unicode normalization MERGED @mikedilger
NIP-49 [breaking]: password normalized to unicode NFKC format MERGED @mikedilger
NIP-49: Fix correct PASSPHRASE to PASSWORD MERGED @ocknamo
NIP-49: Private key encryption MERGED @mikedilger