Page 187, last paragraph, line 7 :
(again, with the exception of the Ractor library). Ruby installations that do want to take
“Again” was justified in B1.0 where there was a first parenthesis about Ractor in line 2 :
Historically, Ruby programs have a Global Interpreter Lock (GIL), which insures that only
one thread is actually being executed by Ruby at any time. [(]In Ruby 3.1, there is a new Ruby
construct that works around this— called Ractors—which we’ll talk about at the end of this
chapter.)
Now that this first parenthesis has been suppressed, again is superfluous, or even the whole parenthesis.