Core Dispatch #5

Python 3.15.0 beta 2 landed June 2, with another round of milestones due June 9 and June 23. Expect the practical stuff in 3.15 including a fixed O(n^2) blowup in unicodedata.normalize, XML multi-byte encoding support, and fresh deprecation warnings around ast and abc abstract* helpers, alongside an initial documented Python security policy in the Devguide.