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huffman 8.9.0 Not compatible 👼

Context

# Packages matching: installed
# Name                # Installed # Synopsis
base-bigarray         base
base-threads          base
base-unix             base
conf-findutils        1           Virtual package relying on findutils
conf-gmp              4           Virtual package relying on a GMP lib system installation
coq                   8.14.0      Formal proof management system
dune                  3.6.2       Fast, portable, and opinionated build system
ocaml                 4.12.1      The OCaml compiler (virtual package)
ocaml-base-compiler   4.12.1      Official release 4.12.1
ocaml-config          2           OCaml Switch Configuration
ocaml-options-vanilla 1           Ensure that OCaml is compiled with no special options enabled
ocamlfind             1.9.5       A library manager for OCaml
zarith                1.12        Implements arithmetic and logical operations over arbitrary-precision integers
# opam file:
opam-version: "2.0"
maintainer: "palmskog@gmail.com"
homepage: "https://github.com/coq-community/huffman"
dev-repo: "git+https://github.com/coq-community/huffman.git"
bug-reports: "https://github.com/coq-community/huffman/issues"
license: "LGPL-2.1-or-later"
synopsis: "A Coq proof of the correctness of the Huffman coding algorithm"
description: """
This projects contains a Coq proof of the correctness of the Huffman coding algorithm,
as described in David A. Huffman's paper A Method for the Construction of Minimum-Redundancy
Codes, Proc. IRE, pp. 1098-1101, September 1952.
"""
build: [make "-j%{jobs}%"]
install: [make "install"]
depends: [
  "ocaml"
  "coq" {>= "8.7" & < "8.10~"}
]
tags: [
  "category:Computer Science/Decision Procedures and Certified Algorithms/Correctness proofs of algorithms"
  "category:Miscellaneous/Extracted Programs/Combinatorics"
  "keyword:data compression"
  "keyword:code"
  "keyword:huffman tree"
  "logpath:Huffman"
  "date:2019-05-15"
]
authors: [
  "Laurent Théry"
]
url {
  src: "https://github.com/coq-community/huffman/archive/v8.9.0.tar.gz"
  checksum: "sha256=20b63eae0d17a23646446fcca22de945d6a19a03246bec8b5b4c8da6d6f3184b"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-huffman.8.9.0 coq.8.14.0

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.14.0).
The following dependencies couldn't be met:
  - coq-huffman -> coq < 8.10~ -> ocaml < 4.10
      base of this switch (use `--unlock-base' to force)
No solution found, exiting

Dry install without Coq/switch base, to test if the problem was incompatibility with the current Coq/OCaml version:

Command: opam remove -y coq; opam install -y --show-action --unlock-base coq-huffman.8.9.0
Return code: 0

Install dependencies

Command: true
Return code: 0
Duration: 0 s

Install 🚀

Command: true
Return code: 0
Duration: 0 s

Installation size

No files were installed.

Uninstall 🧹

Command: true
Return code: 0
Missing removes: none
Wrong removes: none