[Bug 1763179] Re: Returned strings should not be forced into unicode

[Corey Bryant]

** Also affects: python-oslo.versionedobjects (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: python-oslo.versionedobjects (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Changed in: python-oslo.versionedobjects (Ubuntu Bionic)
       Status: New => Triaged

** Changed in: python-oslo.versionedobjects (Ubuntu Bionic)
   Importance: Undecided => High

** Also affects: cloud-archive
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/queens
   Importance: Undecided
       Status: New

** Changed in: cloud-archive/queens
       Status: New => Triaged

** Changed in: cloud-archive/queens
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1763179

Title:
  Returned strings should not be forced into unicode

Status in Ubuntu Cloud Archive:
  Triaged
Status in Ubuntu Cloud Archive queens series:
  Triaged
Status in oslo.versionedobjects:
  Fix Released
Status in python-oslo.versionedobjects package in Ubuntu:
  Triaged
Status in python-oslo.versionedobjects source package in Bionic:
  Triaged

Bug description:
  Change https://review.openstack.org/#/c/557778/ changed the return
  value for coerce() to explicitly force the value to be unicode. This
  causes problems with Python 2 runtimes, where the expected value of a
  string is no longer a string but now unicode (see:
  https://github.com/openstack/cinder/blob/b89e73a2ac315927d2eee42129597b14e87ba685/cinder/tests/unit/volume/drivers/dell_emc/vmax/test_vmax.py#L3412)

  The correct fix should be to use either six.text_type to convert it,
  or format it into a string as is being done, but without forcing it to
  be a unicode string. "%s" will end up being the correct type depending
  on whether it is running under py2 or py3.

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