Gitlab backup with GZIP_RSYNCABLE option

Gitlab version: 14.10.0
Gitlab distr: omnibus package

I noticed (first of all due to my mistake) that “gzip_rsyncable” backup option is case-sensitive:
Command “gitlab-backup create BACKUP=dump GZIP_RSYNCABLE=yes” produces rsyncable backup,
but command “gitlab-backup create BACKUP=dump GZIP_RSYNCABLE=YES” produces “partly” rsyncable backup: db, repositories in tar archive are rsyncable, lfs.tar.gz - not rsyncable, is fully copied.

Is it possible to make case-insensitive ?