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In this changelog, we document "large-ish" changes to Iris that affect even the
way the logic is used on paper.  We also mention some significant changes in the
Coq development, but not every API-breaking change is listed.  Changes marked
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`[#]` still need to be ported to the Iris Documentation LaTeX file(s).
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## Iris 3.0 (unfinished)
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* There now is a deprecation process.  The modules `*.deprecated` contain
  deprecated notations and definitions that are provided for backwards
  compatibility and will be removed in a future version of Iris.
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* View shifts are radically simplified to just internalize frame-preserving
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  updates.  Weakestpre is defined inside the logic, and invariants and view
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  shifts with masks are also coded up inside Iris.  Adequacy of weakestpre is
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  proven in the logic. The old ownership of the entire physical state is
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  replaced by a user-selected predicate over physical state that is maintained
  by weakestpre.
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* Use OFEs instead of COFEs everywhere.  COFEs are only used for solving the
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  recursive domain equation.  As a consequence, CMRAs no longer need a proof of
  completeness.  (The old `cofeT` is provided by `algebra.deprecated`.)
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* Implement a new agreement construction.  Unlike the old one, this one
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  preserves discreteness.
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* Renaming and moving things around: uPred and the rest of the base logic are in
  `base_logic`, while `program_logic` is for everything involving the general
  Iris notion of a language.
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* Slightly weaker notion of atomicity: an expression is atomic if it reduces in
  one step to something that does not reduce further.
* Changed notation for embedding Coq assertions into Iris.  The new notation is
  ⌜φ⌝.  Also removed `=` and `⊥` from the Iris scope.  (The old notations are
  provided in `base_logic.deprecated`.)
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* Up-closure of namespaces is now a notation (↑) instead of a coercion.
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* With invariants and the physical state being handled in the logic, there is no
  longer any reason to demand the CMRA unit to be discrete.
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* The language can now fork off multiple threads at once.
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* Local Updates (for the authoritative monoid) are now a 4-way relation with
  syntax-directed lemmas proving them.
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## Iris 2.0

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* [heap_lang] No longer use dependent types for expressions.  Instead, values
  carry a proof of closedness.  Substitution, closedness and value-ness proofs
  are performed by computation after reflecting into a term langauge that knows
  about values and closed expressions.
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* [program_logic/language] The language does not define its own "atomic"
  predicate.  Instead, atomicity is defined as reducing in one step to a value.
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* [program_logic] Due to a lack of maintenance and usefulness, lifting lemmas
  for Hoare triples are removed.

## Iris 2.0-rc2

This version matches the final ICFP paper.

* [algebra] Make the core of an RA or CMRA a partial function.
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* [program_logic/lifting] Lifting lemmas no longer round-trip through a
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  user-chosen predicate to define the configurations we can reduce to; they
  directly relate to the operational semantics.  This is equivalent and
  much simpler to read.
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## Iris 2.0-rc1

This is the Coq development and Iris Documentation as submitted to ICFP.