$ git log -1 v0.5.3 -- ext/optimized_locking/optimized_locking.c found last record of `ext/optimized_locking/optimized_locking.c' in the following commit: 36e69be Removed old optimized_locking code in favor of fastthread by same mentalguy. (2006-11-20)git clone https://yhbt.net/unicorn.git