class ActiveSupport::DescendantsTracker::DescendantsArray

:nodoc:
on Ruby 2.7 or 3.0 can trigger a Ruby crash: bugs.ruby-lang.org/issues/18928<br>Note: DescendantsArray is redundant with WeakSet, however WeakSet when used
DescendantsArray is an array that contains weak references to classes.

def <<(klass) 

def <<(klass)
  @refs << WeakRef.new(klass)
end

def cleanup! 

def cleanup!
  @refs.delete_if { |ref| !ref.weakref_alive? }
end

def each 

def each
  @refs.reject! do |ref|
    yield ref.__getobj__
    false
  rescue WeakRef::RefError
    true
  end
  self
end

def initialize 

def initialize
  @refs = []
end

def refs_size 

def refs_size
  @refs.size
end

def reject! 

def reject!
  @refs.reject! do |ref|
    yield ref.__getobj__
  rescue WeakRef::RefError
    true
  end
end