The swift-4.1-branch will be initially cut from master.master will be merged into swift-4.1-branch until the final branch date.swift-4.1-branch will have changes merged from master one last time. After the final branch date there will be a “bake” period in which only select, critical fixes will go into the release (via pull requests).masterへマージされれば入るかと(revertされなければ)