//	   Obtaining a whole span amortizes the cost of locking
//	   the mcentral.
//
//	3. If the mcentral's mspan list is empty, obtain a run
//	   of pages from the mheap to use for the mspan.
//
//	4. If the mheap is empty or has no page runs large enough,
//	   allocate a new group of pages (at least 1MB) from the
//	   operating system. Allocating a large run of pages
//	   amortizes the cost of talking to the operating system.
//

    return new MergingIterator<>(iterators, comparator);
  }

  /**
   * An iterator that performs a lazy N-way merge, calculating the next value each time the iterator
   * is polled. This amortizes the sorting cost over the iteration and requires less memory than
   * sorting all elements at once.
   *
   * <p>Retrieving a single element takes approximately O(log(M)) time, where M is the number of

    return new MergingIterator<>(iterators, comparator);
  }

  /**
   * An iterator that performs a lazy N-way merge, calculating the next value each time the iterator
   * is polled. This amortizes the sorting cost over the iteration and requires less memory than
   * sorting all elements at once.
   *
   * <p>Retrieving a single element takes approximately O(log(M)) time, where M is the number of

	mcache      *mcache
	pcache      pageCache
	raceprocctx uintptr

	deferpool    []*_defer // pool of available defer structs (see panic.go)
	deferpoolbuf [32]*_defer

	// Cache of goroutine ids, amortizes accesses to runtime·sched.goidgen.
	goidcache    uint64
	goidcacheend uint64

	// Queue of runnable goroutines. Accessed without lock.
	runqhead uint32
	runqtail uint32
	runq     [256]guintptr

					nVersions++
				}
			}
		}

		// Remove from all streams up until latest modtime or if selected.
		for i, vers := range versions {
			for _, ver := range vers {
				// Truncate later modtimes, not selected.
				if ver.header.ModTime > latest.header.ModTime {
					versions[i] = versions[i][1:]
					continue
				}
				// Truncate matches
				if ver.header == latest.header {

keep it longest, but yet will lose it in a short time. Whence it is easy to understand, that if many contiguous Vortices of molten Pitch were each of them as large as those which some suppose to revolve about the Sun and fix'd Stars, yet these and all their Parts would, by their Tenacity and Stiffness, communicate their Motion to one another till they all rested among themselves. Vortices of Oil or Water, or some fluider Matter, might continue longer in Motion; but unless the Matter were void of all...

it in a short time. Whence it is easy to understand, that if many
contiguous Vortices of molten Pitch were each of them as large as those
which some suppose to revolve about the Sun and fix'd Stars, yet these
and all their Parts would, by their Tenacity and Stiffness, communicate
their Motion to one another till they all rested among themselves.
Vortices of Oil or Water, or some fluider Matter, might continue longer