Possible feature: Request specific version of package

[DesiQuintans]

I don't have a projected date for when/if this will be added, but Librarian's bare-names system makes the user interface part of this very approachable, at least. It ought to be possible to request a specific package using

shelf(lorem[1.3.0], ipsum[0.0.5], dolor)

in which case lorem v1.3.0, ipsum v0.0.5 and the latest version of dolor will installed from CRAN.

[DesiQuintans]

I've implemented this for GitHub packages by piggybacking on what remotes is already doing:

# Install a branch, commit, or tag, in this case tag v1.6.8
shelf("user/package@v1.6.8")

# Install the newest release
shelf("user/package@*release")

# Install pull request #212
shelf("user/package#212")

remotes doesn't do this for CRAN packages, but I think that I can create support for it anyway by parsing the name and feeding it to remotes::install_version().

[rosherbal]

Would it be possible to do it too with BiocManager?