[[!comment format=mdwn
 username="Ilya_Shlyakhter"
 avatar="http://cdn.libravatar.org/avatar/1647044369aa7747829c38b9dcc84df0"
 subject="comment 2"
 date="2021-04-12T14:42:11Z"
 content="""
Never mind, `TRANSFER STORE` is not specified to fail if the key is already stored, so not usable for locking.
"""]]
