package/gren-lang/core/version/5.1.0/module/Array.Builder">Array.Builder</a>, has been added to further improve performance of building large <code>Array</code>s. It uses mutation under the hood, but it isn&#039;t observable outside of a debugger.</p><p>In summary, you should see noticeable improvements in performance with the latest compiler and core packages.</p><h2>Improved debugging</h2><p>The changes to the compiler also improves debugging by cleaning up the call stack. Function names now show up for u