* **(breaking change)** `IO#gets`, `IO#each_line`, `String#lines`, `String#each_line`, etc. now chomp lines by default. You can pass `chomp: false` to prevent automatic chomping. Note that `chomp` is `true` by default for argless `IO#gets` (read line) but `false` if args are given.

* **(breaking change)** `HTTP::Handler` is now a module instead of a class (thanks @andrewhamon)

* Added `URI#normalize` and `normalize!` (thanks @taylorfinnell)

* Added `reuse` optional argument to many `Array`, `Enumerable` and `Iterable` methods that allow you to reuse the yielded/return array for better performance and less memory footprint

* The `:debug` flag is now present when compiled with `--debug`, useful for doing `flag?(:debug)` in macros (thanks @luislavena)