# 3.4



* Feature #18980: Re-reconsider numbered parameters: `it` as a default block parameter
* Feature #19472: Ractor::Selector to wait multiple ractors
* Feature #18576: Rename `ASCII-8BIT` encoding to `BINARY`
* Feature #19117: Include the method owner in backtraces, not just the method name
* Feature #20275: Avoid extra backtrace entries for rescue and ensure
* Bug #20325: Enumerator.product.size bug with zero * infinite enumerators
* Feature #19057: Hide implementation of `rb_io_t`.