I could find only 59 mutable defaults left in addons (I made a MP to fix them) 
and 84 in the client. At this point I think it's realistic to target 6.2.
Lionel.

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https://bugs.launchpad.net/bugs/525808

Title:
  Default values should be immutable

Status in OpenERP Addons (modules):
  Opinion
Status in OpenERP Addons extra-trunk series:
  Opinion
Status in OpenERP Addons trunk series:
  Opinion
Status in OpenERP GTK Client:
  Opinion
Status in OpenERP Server:
  Fix Released
Status in OpenERP Server trunk series:
  Fix Released

Bug description:
  Often in the code base we have:
  def foo(...., context={},....):
      ....
  As explained in comment #1, this should be changed to
  def foo(...., context=None,....):
      # you should add this test only if the context is actually used
      if context is None:
          context={}
      ....

  (This bug originally proposed the other way round hence the "nope" in
  comment #1.)

  (xmo) Complements of information:

  * The test should be `context is None` rather than `not context`: the caller 
could provide an empty dict argument {} and expect to have data in it after the 
call, if a test is done using `not context` an empty dict will match and the 
function will be creating a brand new context.
  * The test should *only ever* performed when the current function fetches 
data from the context. If you don't do anything with the context but forward it 
to other functions and methods (e.g. read() or create()), no need to test for 
anything.

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