Weird

ruby_bug.rb

# frozen_string_literal: true

require 'psych'

class Foo
  def value
    return @value if defined?(@value)

    @value = {
      fix_encoding('foo') => fix_encoding('a' * 24),
      fix_encoding('bar') => fix_encoding('b' * 24),
    }
  end

  def forgetting_assignment
    Psych.dump(value)
  end

  def fix_encoding(string)
    string.encode(Encoding::ASCII).gsub(/bla/i, '')
  end
end

4.times { GC.start }
GC.disable
before_last_change = Foo.new
before_last_change.forgetting_assignment

p before_last_change.value
4.times { GC.start }
p before_last_change.value