I will start:
a) as.Date(“2022-Jul-01”, format =“%Y-%b-%d”) will or will not work depending on os language
b) how R handles diacritics and encoding differently on Linux and on windows
c) Rstudio :D
With C, Jetbrain’s DataSpell supports R, though it is primarily Python, and the EAP version is free, though you will have to reinstall every month.