Racket v5.3.4 * Extflonums (80-bit floating-point numbers) are supported on some x86/x86_64 platforms -- including Windows, and including platforms where Racket is compiled to use SSE instructions for flonum arithmetic. Thanks to Michael Filonenko. * OS X: DrRacket and all of the other apps are now signed with an official key. * Tally Maze: a new game based an enumeration of 2d mazes. * The Optimization Coach, a DrRacket plugin, has been moved from the Racket distribution to the Racket package repository. Install it with: raco pkg install optimization-coach * Redex: `define-union-language' now merges productions when languages define the same nonterminals. Thanks to William Bowman. * The `srfi/19' library is now compatible with the date structure type exported by `racket/base'.