This release marks April's substantial fulfillment of its design goals: implementing a modern APL compiling to Common Lisp, with all the expected tools available for array processing and mathematics. With a standard library containing many useful functions ported from Dyalog's online dfns and some other interesting demos, April is ready to take on a wide range of tasks. Many fixes and refinements undoubtedly remain for April and there are many potential optimizations on the horizon, but now is the point at which April has become what it was intended to be.
Innumerable changes have been made since the previous release, and it's likely that not 1% of the codebase from that time remains. From this point April will enter a more steady cadence of releases charting progress toward new features and improvements.