tag: remove a mutable default argument Mutable default arguments are know to the state of California to cause bugs. We just added support of None for the underlying function, so nothing else the required.

commit: remove a mutable default argument Mutable default arguments are know to the state of California to cause bugs.

lock: move acquirefn call to inside the lock We're going to need to call it again as part of reinitialization after a subprocess inherits the lock.

localrepo: call lock.lock with releasefn as a keyword arg We'll be adding an acquirefn argument soon, and this makes that clearer.