- Update to version 8.19.1.
* Fixed incorrect abstraction of sort variables for opaque
constants leading to an inconsistency.
* Fixed memory corruption with `vm_compute` (rare but more
likely with OCaml 5.1).
* "Found no matching notation to enable or disable" is now a
warning instead of an error.
* Fixed undeclared universe with multiple uses of `abstract`.
* Fixed incorrect printing of constructor values with multiple
arguments, and over-parenthesizing of constructor printing.
* Fixed incorrect declared type for Ltac2.FMap.fold.