[Rd] contrib.url and R-devel numbering 3.7 vs 4.0

[Jan Gorecki]

Dear R-devel,

Due to the numbering change of R-devel from 3.7 to 4.0 there seems to
be an issue happening in a helper function contrib.url, maybe some
others too.
When running on a Windows r77294 (2019-10-15)

    contrib.url("https://cloud.r-project.org", type="binary")
    #[1] "https://cloud.r-project.org/bin/windows/contrib/4.0"

Resulting string is actually not a the proper one. As of now CRAN
still uses 3.7.
It is not clear if migration to 4.0 urls will happen or R-devel CRAN
will stay as 3.7.

Anyway I would like to request, again, to consider my suggestion from
May 2018 that makes contrib.url more flexible, allowing to handle
issue discussed in this email.
https://bugs.r-project.org/bugzilla/show_bug.cgi?id=17420

Best Regards,
Jan Gorecki