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Dropped PHP 5.x and 7.0 support - minimum of PHP 7.1 requirement #785
Well, according Saldaek in the issue you have provided, there's less people using HHVM and Composer, than PHP 5.3 (~0.4%). If I may be so bold, I would suggest sidelining (if not dropping altogether) support for it, since it only slows down development progress without being actually used by any substantial number of people.
I know, it is not your call, but maybe someone else in the Doctrine team will consider this.
I think @szymach's observation makes it clear: supporting HHVM is not worth it, and won't be worth it any soon due to the amount of effort needed to do it, while a lot of its PHP5 compatibility issues remain unpatched (and aren't in the project's focus either, as it seems).
We can drop HHVM if we do an announcement, since we did indeed guarantee compatibility (see http://www.doctrine-project.org/2013/12/23/our-hhvm-roadmap.html )