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Showing content from https://docs.ruby-lang.org/en/master/WeakRef.html below:

class WeakRef - Documentation for Ruby 3.5

Weak Reference class that allows a referenced object to be garbage-collected.

A WeakRef may be used exactly like the object it references.

Usage:

foo = Object.new            
p foo.to_s                  
foo = WeakRef.new(foo)      
p foo.to_s                  
GC.start                    
p foo.to_s                  

VERSION

def initialize(orig)
  case orig
  when true, false, nil
    @delegate_sd_obj = orig
  else
    @@__map[self] = orig
  end
  super
end

Creates a weak reference to orig

def weakref_alive?
  @@__map.key?(self) or defined?(@delegate_sd_obj)
end

Returns true if the referenced object is still alive.

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