At least on Unix, possibly on Windows as well:
❯ rs <- callr::r_session$new() ❯ rs$run(function() 1+1) [1] 2 ❯ rs$run(function() ps::ps_num_fds(ps::ps_handle())) [1] 8 ❯ rs$run(function() 1+1) [1] 2 ❯ rs$run(function() ps::ps_num_fds(ps::ps_handle())) [1] 12
They are probably simply not closed in the post-hook.
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