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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
coq                 8.12.1      Formal proof management system
num                 1.4         The legacy Num library for arbitrary-precision integer and rational arithmetic
ocaml               4.08.1      The OCaml compiler (virtual package)
ocaml-base-compiler 4.08.1      Official release 4.08.1
ocaml-config        1           OCaml Switch Configuration
ocamlfind           1.9.3       A library manager for OCaml
# 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.8.12.1

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.12.1).
The following dependencies couldn't be met:
  - coq-huffman -> coq < 8.10~ -> ocaml < 4.06.0
      base of this switch (use `--unlock-base' to force)
Your request can't be satisfied:
  - No available version of coq satisfies the constraints
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