This release is fixes some IDE features in .hack files, especially in .hack files which contain the string <?hh such as code generators.

Unfortunately, fixing this required breaking the same IDE features for PHP files that contain leading markup (content before the <?) - for example:

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<html>
<head>
<title><?php echo htmlspecialchars(get_page_title(); ?></title>
</head>
...
</html>

Files that start with <? or a shebang line (e.g. #!/usr/bin/env hhvm) immediately followed by <? at the start of the second line are not affected.

Additionally, our MacOS packages have been rebuilt to workaround some incompatibilities with recent versinos of dependencies, and to require Sandybridge-or-newer processors. Requiring Sandybridge provides a 19x speedup over Homebrew’s defaults for some real-world workloads.