Author michael.foord
Recipients Vlastimil.Zíma, davin, michael.foord, peter.otten, r.david.murray, serhiy.storchaka
Date 2017-01-11.10:52:06
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Message-id <1484131926.31.0.502786003251.issue20804@psf.upfronthosting.co.za>
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I think option 3 is the correct semantic behaviour for sentinels, and if there are already examples of this in the standard library then it *doesn't* violate expected behaviour of pickling and copying (sentinel and singleton objects can be permitted to retain this property through copying and pickling if it is a document facet of their behaviour and a natural result of their use cases).

Sentinels exist *purely* to have unique, *identifiable* objects. So retaining identity is their "expected behaviour" as identity is their defining feature. 

So Serhiy, if you're happy that you've implemented this correctly - with tests and documentation updates (I see a separate doc patch) - go ahead and commit.
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Date User Action Args
2017-01-11 10:52:06michael.foordsetrecipients: + michael.foord, peter.otten, r.david.murray, serhiy.storchaka, Vlastimil.Zíma, davin
2017-01-11 10:52:06michael.foordsetmessageid: <1484131926.31.0.502786003251.issue20804@psf.upfronthosting.co.za>
2017-01-11 10:52:06michael.foordlinkissue20804 messages
2017-01-11 10:52:06michael.foordcreate