Release builds called scr_str_release for every string release, so a record update by object spread paid a call for each string field it dropped. A string release now uses the emitted fast-path helper, as string retains do; in release builds a function with more than 8 string release sites keeps the runtime call at each, so string-heavy builders and module initializers grow little. Speed builds are unchanged.
Chris Tate
bc6a824b55