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https://bugs.launchpad.net/bugs/1780099

Title:
  Cache remapping breaks hashing of Package objects

Status in python-apt package in Ubuntu:
  Fix Committed
Status in python-apt source package in Bionic:
  Fix Released

Bug description:
  [Impact]
  The apt.Package objects use the id as the hash, but the hash can change after 
reopening, meaning that code will fail to work, for example:

  c=apt.Cache()
  p=c["a"]
  set_of_p={p}
  c.open()
  assert p in set_of_p

  will fail.

  [Test case]
  The above test case is run as part of autopkgtest (syntax is slightly 
different), so passing autopkgtests means verification is done.

  [Regression potential]
  Hashing packages objects will be slower as it hashes the name and 
architecture now.

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