When to quote a package name

Dear HelpeRs,

I'm confused about the role of quotes around package names on the
library and detach functions. Books on R use both approaches:

library(Hmisc)
describe(mydata)
detach(package:Hmisc)

and

library("Hmisc")
describe(mydata)
detach("package:Hmisc")

The help file for detach says "quoted or unquoted" and the help file for
library says about the package, "the name of a package, given as a name
or literal character string, or a character string, depending on whether
character.only is FALSE (default) or TRUE)."

Are there conditions under which it matters? Which is best?

When to quote a package name

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