As of today Drupal core does not fail with any tests, but PHP serialize_precision setting for PHP 7.1 is incorrect in test bots and cause incorrect numbers in Drupal settings JSON.

Proposed resolution

Add a test that fails if serialize_precision setting is incorrect.

Remaining tasks

Write patch that tests JSON output like Google Analytics does. See

User interface changes


API changes


Data model changes



hass created an issue. See original summary.

andypost’s picture

I think that should be added to reports/status error as well - visible to end user

Version: 8.5.x-dev » 8.6.x-dev

Drupal 8.5.0-alpha1 will be released the week of January 17, 2018, which means new developments and disruptive changes should now be targeted against the 8.6.x-dev branch. For more information see the Drupal 8 minor version schedule and the Allowed changes during the Drupal 8 release cycle.