acl_delete_flag_np(3) on macOS
The text a1af25f55785, as macOS 26.5, macOS 26.4, macOS 26.3, macOS 26.2, macOS 26.1, macOS 26.0, macOS 15.6, macOS 15.5, macOS 15.4, macOS 15.3, macOS 15.2, macOS 15.1, macOS 15.0 shipped it. The page shows this text now.
delete flags from a flag set