Change record status: 
Project: 
Introduced in branch: 
Introduced in version: 
Description: 

Trimming, a path alias has changed from trimming all slashes, backslashes and white spaces at the end of a string, using rtrim, to using a dedicated method called trimAlias, defined in /core/modules/path_alias/src/Entity/PathAlias.php. This function has a similar approach, where it also trims the above, but additionally ignores a single slash. This way, root ("/") can be used as a valid path alias without it being trimmed.

Impacts: 
Module developers