v6.0.0

6.0.0 (2026-10-19)

Bug Fixes

• idna: keep ß for the TLDs that require non-transitional processing (c88c046)

BREAKING CHANGES

• idna: IDNAConverter and IDNAProcessor.toASCII() now return
  xn--fa-hia.de for faß.de (was fass.de) and fass.com for faß.com (was
  xn--fa-hia.com); the same applies to ς, ZWJ and ZWNJ under these TLDs.
  Callers that need the previous result pass useTransitional explicitly.

Refs: RSRMID-3015