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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).

## Iris 3.0

* [#] View shifts are radically simplified to just internalize frame-preserving
  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 proven in the logic.
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* [#] The language can now fork off multiple threads at once.
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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.