- Update to version 8.18.0.
* The default locality of `Hint` and `Instance` commands was
switched to `export`.
* The universe unification algorithm can now delay the commitment
to a sort (the algorithm used to pick `Type`). Thanks to this
feature many `Prop` and `SProp` annotations can be now omitted.
* Ltac2 supports array literals, maps and sets of primitive
datatypes such as names (of constants, inductive types, etc)
and fine-grained control over profiling.
* The warning system offers new categories, enabling finer
(de)activation of specific warnings. This should be
particularly useful to handle deprecations.
* Many new lemmas useful for teaching analysis with Coq are now
part of the standard library about real numbers.
* The `#[deprecated]` attribute can now be applied to definitions.