With PHP 5.6 EOL for a couple of months now and all our 1.0 releases working from PHP 5.3 (even though we strongly reccomand 7+) and upwards I think it is time to start dropping support for PHP 5 all together. This would open up to features like [] instead of array() for arrays, ::class constants, yield etc etc. And of course all the goodies PHP 7 brought, I've been using them in @php-api-clients for the past year and they work well IMHO. IMHO the question isn't whether we should do this but if we should do this in 1.1+ or in 2.0.