Upgraded to Tahoe 26.4 and Xcode 26.4 and realized Xcode is missing the documentation for Foundation. Occasionally, if other (not yet missing) documentation references a Foundation entity, such as a type, clicking on it may open in a web browser pointing to the externally hosted Apple documentation.
Anyone else experiencing this or have a workaround (perhaps the documentation files are on disk but were somehow lost / disconnected from the Xcode doc browser)?
I checked the release notes for 26.4 and for 26.3 but did not find a mention of anything like that.
Filed an issue with Apple, please do too if you are affected so hopefully it will see some love and lead to restoring the documentation.
Edited: found some possibly related files in my ~/Library and the newer version v302 (26.4 related, I think, is considerably smaller):
du -sh ~/Library/Developer/Xcode/DocumentationCache/* | awk -F/ '{print $NF "\t" $1}'
v296 1.0G
v302 507M