[Subversion] Meta data format version of the working copy

For all the versions (I think as of version 1.7) that store the meta data not any longer in files but in a SQLite database, the entries in .svn/format or .svn/entries are plainly wrong. They might be a left over of previous client versions.
You need to execute

PRAGMA user_version

against the working copy database .svn/wc.db.
You can do so with  DB Browser for SQLite or on the command line

sqlite3 .svn/wc.db "PRAGMA user_version"

I found this at https://stackoverflow.com/questions/19265363/find-out-svn-working-copy-version-1-7-or-1-8

Meta data format version	Client version
31	1.8.x
32	1.9.x
Meta data format version	Client version