bash-completion conflict

[kakawait]

I tried to follow that tutorial https://www.clever-cloud.com/devoxxfr (Yeah I will really like to be at DevoxxFR :)), I had a small issue.

Indeed, since I'm using bash-completion 2 (instead of bash-completion 1) I got the following error when running brew install CleverCloud/tap/clever-tools

 brew install CleverCloud/tap/clever-tools
Updating Homebrew...
==> Auto-updated Homebrew!
Updated 3 taps (caskroom/cask, caskroom/versions, homebrew/core).
==> Updated Formulae
openssl ✔       amber           apibuilder-cli  azure-cli       buku            dartsim         headphones      jbig2enc        languagetool    libatomic_ops   mame            mariadb@10.1    mediaconch      pygobject3      rust            typescript      yq
openssl@1.1 ✔   ant             artifactory     ballerina       bzt             dovecot         heroku          joplin          laszip          lmod            mariadb         media-info      pdal            rom-tools       terragrunt      webpack

==> Tapping clevercloud/tap
Cloning into '$HOME/.homebrew/Library/Taps/clevercloud/homebrew-tap'...
remote: Counting objects: 6, done.
remote: Compressing objects: 100% (5/5), done.
remote: Total 6 (delta 1), reused 4 (delta 0), pack-reused 0
Unpacking objects: 100% (6/6), done.
Tapped 1 formula (31 files, 23.8KB)
==> Installing clever-tools from clevercloud/tap
==> Installing dependencies for clevercloud/tap/clever-tools: bash-completion, zsh-completions
==> Installing clevercloud/tap/clever-tools dependency: bash-completion
Error: Cannot install bash-completion because conflicting formulae are installed.
  bash-completion@2: because Differing version of same formula

Please `brew unlink bash-completion@2` before continuing.

Unlinking removes a formula's symlinks from $HOME/.homebrew. You can
link the formula again after the install finishes. You can --force this
install, but the build may fail or cause obscure side-effects in the
resulting software.

Since I don't want to unlink my bash-completion@2 since I'm using it.

There is a simple by-pass

brew install --ignore-dependencies CleverCloud/tap/clever-tools
# or
brew install --without-bash-completion CleverCloud/tap/clever-tools

Why I opened that issue, since there is a bypass? In fact is more related about discussion on twitter with @waxzce https://twitter.com/waxzce/status/978905316124393472

So feel free to close it if not relevant.

I'm not Formulae expert dev so I don't know if it's possible to do some feature dectection like

If bash-completion@2 is installed then use it (with compatible completion if needed)
else bash-completion ...

Or make any {bash,zsh}-completion as :optional dependencies instead of :required

Or add some comment/doc to explain bypass for no advance user