Change record status: 
Project: 
Introduced in branch: 
8.6.x
Introduced in version: 
8.6.4
Description: 

Drupal 8.6.4 now supports PHP 7.3

While contributed and custom code should not have to update for core changes, Drupal core did need to make some changes to be compatible with PHP 7.3, which can be seen on the issue.

Impacts: 
Site builders, administrators, editors
Module developers
Site templates, recipes and distribution developers