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`_True`/`_False` lemmas for `decide` and `mguard`

See merge request iris/stdpp!256

make Z.of_nat not a coercion inside std++

See merge request iris/stdpp!257

Don't use Z.to_nat in definition of rotate

See merge request iris/stdpp!259

make Qc_of_Z not a Coercion any more

Closes #102

See merge request iris/stdpp!258

Fix pretty printing of multset literals + add tests

See merge request iris/stdpp!253

Introduce `SingletonMS` class for multiset singletons.

Closes #100, #98, and #87

See merge request iris/stdpp!251

- Define set-like notation `{[+ x1; ..; xn ]}` for multisets in terms of the new
  singleton class and disjoint union `⊎`.
- Remove `SemiSet` instance for multisets.
- Prove lemmas regarding `∈` and `∉` for multisets since we no longer get the
  generic versions for sets.
- Provide `SetUnfoldElemOf` instances for multisets since we no longer get the
  generic versions for sets.
- Prove lemmas new regarding `∈` and `∉` for `∩`

Fixes #100, #98 and #87.

This MR is an alternative to !232.

Fix inconsistent arguments of `subset_difference_elem_of`.

See merge request iris/stdpp!252

Add list_to_map_app

See merge request iris/stdpp!249

Add tactic `learn_hyp`, fixes #73

Closes #73

See merge request iris/stdpp!247

Add lemmas about testbit on bounded integers

See merge request iris/stdpp!248

More lemmas for list's prefix_of and suffix_of

See merge request iris/stdpp!239