Description:
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Looks like some constant values was changed in PHP7.0, after that ReflectionClass->isAbstract() for traits starts to return "false", whereas in earlier versions of PHP result was "true".

Test script:
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<?php
// https://3v4l.org/5RF6l
trait Foo {}

$ref = new ReflectionClass('Foo');
var_dump($ref->isAbstract());

Expected result:
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bool(true)

Actual result:
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bool(false)