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A patch to replace internal_select with poll(2) where
available is acceptable. The current version should be
conditionally kept. That Windows doesn't have poll(2) is no
problem: its select implementation supports arbitrarily
large FDs (just like poll).

Relaxing the IS_SELECTABLE usage to cases where select is
actually going to be called is optional: there shouldn't be
too many systems left without select where people still want
to open many file descriptors.