Mounts should delay retrieving the path information as long as possible #1375

Job	Run time
R-CMD-check / setup	52s
website / pkgdown	4m 36s
routine / routine	3m 7s
R-CMD-check / macOS-latest (4.4.2)	2m 38s
R-CMD-check / windows-latest (4.4.2)	3m 20s
R-CMD-check / ubuntu-latest (devel)	3m 30s
R-CMD-check / ubuntu-latest (4.4.2)	2m 42s
R-CMD-check / ubuntu-latest (4.3.3)	3m 13s
R-CMD-check / ubuntu-latest (4.2.3)	3m 15s
R-CMD-check / ubuntu-latest (4.1.3)	3m 27s
R-CMD-check / ubuntu-latest (4.0.5)	3m 35s
	34m 15s

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