irw_fetch() and irw_itemtext() keep each table they download in this
folder, so later sessions do not export it again – every export counts
against the Redivis 30-day export cap. The Python package uses the same
folder and files, so a table fetched in either language is reused by the
other.
Details
The folder is the IRW_CACHE_DIR environment variable if set, otherwise
~/.cache/irw on Linux (or $XDG_CACHE_HOME/irw), ~/Library/Caches/irw
on macOS and %LOCALAPPDATA%/irw/Cache on Windows.
Switch the cache off with options(irw.cache = FALSE) for a session, or
IRW_CACHE=0 for all of them.