End of Life Ruby 3.2 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

Delegator#!

# File tmp/rubies/ruby-3.2.0/lib/delegate.rb, line 180
def !
  !__getobj__
end

Delegates ! to the __getobj__

See also #!= .new #== also in 4.1 · 4.0 · 3.4 · 3.3 · 3.1 · 3.0