sleep(...) public

Suspends the current thread for duration seconds (which may be any number, including a Float with fractional seconds). Returns the actual number of seconds slept (rounded), which may be less than that asked for if another thread calls Thread#run. Zero arguments causes sleep to sleep forever.

   Time.new    #=> Wed Apr 09 08:56:32 CDT 2003
   sleep 1.2   #=> 1
   Time.new    #=> Wed Apr 09 08:56:33 CDT 2003
   sleep 1.9   #=> 2
   Time.new    #=> Wed Apr 09 08:56:35 CDT 2003
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