Irmin_watcherSourceIrmin watchers.
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v id p f is the listen hook calling f everytime a sub-path of p is modified. Return a function to call to remove the hook. Default to polling if no better solution is available. FSevents and Inotify backends are available.
hook t is an Irmin.Watcher compatible representation of v.
set_polling_time f set the polling interval to f. Only valid when mode = `Polling.