id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc
18395,Non-URL GUIDs are stripped on post update,alexkingorg,,"The post guid is run through several filters before the post is saved. the esc_url_raw() call will end up setting a GUID to an empty string if the GUID does not begin with a known/accepted protocol.

If a plugin/etc. wants to use the GUID column to store an external ID for an item brought in from another system (say a Flickr photo ID), then updating a post that has the Flickr ID as its GUID through the WP admin will end up setting the GUID for that post to ''.

This would need to be changed if the move was made to UUIDs for GUID values as well. Related: #6492.

A very basic patch for this specific issue is attached, but a larger discussion around how this should work is likely needed. Related: #18315",defect (bug),new,normal,Awaiting Review,Validation,3.2.1,normal,,,rboren