[tobixen]

Disclaimer: Code and the text below the line are AI-generated, by Claude Opus 5.5, from the prompts:

work on the new issues [the ten issues filed on 2026-10-20, https://github.com//issues/14 to /23]
(asked whether a read should warn and skip, raise with partial results, or only guard the searcher error) Raise, partial results
(asked whether to do the larger conformance issues now) Do them now

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Fixes the ten issues from the review of PR 8 and PR 9.

• Library bugs. An emulated move() checks the etag before copying, and removes the copy if the delete then fails on a stale etag (Emulated move() checks the etag only after copying; each retry leaves another stale copy #23). An emulated sync token is now tied to the backend as well as the collection id (Emulated change feed accepts a sync token from another backend's collection with the same id #20).
• One bad object no longer hides the rest (A valid RDATE series with an override makes search() raise for the whole collection #14, One VTODO that icalendar cannot parse makes search(), get() and changes() fail for the whole collection #22). Listing primitives return a BrokenObject instead of raising. A read that left something out raises PartialResultError, carrying what it could read and the raw bytes of the rest; Workspace.search() keeps the partial results. A broken object is never reported as deleted.
• The conformance suite:
  • it cleans up only what it created on a borrowed collection, and reuses collections where it cannot delete them (On a borrowed collection the conformance suite renames it for good and can delete other clients' items #18, Conformance suite leaves its collections behind on backends that cannot delete collections #19);
  • it lists more than a page (Conformance suite never lists more than seven objects, so a backend that reads only the first page passes #16);
  • it tests the API_DESIGN contract clauses (Conformance suite does not test several API_DESIGN contract clauses #17);
  • it round-trips a corpus of real-world objects with verify=True, which needed three new §5.1 features, alarms, timezones and dates (Conformance suite passes backends that lose alarms, time zones, all-day dates, non-ASCII text and recurrence exceptions #15);
  • three more profiles reach its untested branches, and CI fails below 95 % branch coverage of the suite (Conformance suite: several capability branches never run, and test_collection_never_widens_backend cannot fail #21).
    Every new suite test has a broken memory backend that it must catch.

To know before merging:

• The CalDAV backend (Roadmap 2.1: the CalDAV backend #13) must declare alarms, timezones and dates, and should return BrokenObject from _query. Expect the new suite tests to fail against it at first.
• The supported branches of recurrence.edit-occurrence, recurrence.edit-this-and-future and task.complete-recurring are still not run (Q3).
• icalendar-searcher's fix for an RDATE series is not released yet. Until it is, such a series is reported as broken rather than found.

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