Depending on code in this package is bad and will cause you problems with any upgrade! But the 4.x
will be particularly painful to naughty developers that import from this package! We changed a lot
to take advantage of sweet Kotlin features.

#### Credentials.basic()

The username and password parameters to `Credentials.basic()` are now non-null strings. In OkHttp
3.x, null would yield a username or password of "null".

		e := n.entry()
		for e != nil {
			if !yield(e.key, e.value) {
				return false
			}
			e = e.overflow.Load()
		}
	}
	return true
}

const (
	// 16 children. This seems to be the sweet spot for
	// load performance: any smaller and we lose out on
	// 50% or more in CPU performance. Any larger and the
	// returns are minuscule (~1% improvement for 32 children).
	nChildrenLog2 = 4

WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
DAMAGE.

com.esotericsoftware.kryo:kryo
com.esotericsoftware.minlog:minlog
Copyright (c) 2008-2018, Nathan Sweet All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

         * and increasing the threshold to 2^32 doesn't pay for itself, and adding another enum
         * constant hurts performance further -- I suspect because bimorphic implementation is a
         * sweet spot for the JVM.
         */
        return (a * b) % m;
      }

      @Override
      long squareMod(long a, long m) {
        return (a * a) % m;
      }
    },

         * and increasing the threshold to 2^32 doesn't pay for itself, and adding another enum
         * constant hurts performance further -- I suspect because bimorphic implementation is a
         * sweet spot for the JVM.
         */
        return (a * b) % m;
      }

      @Override
      long squareMod(long a, long m) {
        return (a * a) % m;
      }
    },

	// swept set. Likewise, allocating an in-use span pushes it
	// on the swept set.
	//
	// Some parts of the sweeper can sweep arbitrary spans, and hence
	// can't remove them from the unswept set, but will add the span
	// to the appropriate swept list. As a result, the parts of the
	// sweeper and mcentral that do consume from the unswept list may
	// encounter swept spans, and these should be ignored.

	// no more spans to be swept. In this case, either s has already
	// been swept, or is about to be acquired for sweeping and swept.
	sl := sweep.active.begin()
	if sl.valid {
		// The caller must be sure that the span is a mSpanInUse span.
		if s, ok := sl.tryAcquire(s); ok {
			s.sweep(false)
			sweep.active.end(sl)
			return
		}
		sweep.active.end(sl)
	}

	mSyscallID int64

	// maySweep indicates the sweep events should be traced.
	// This is used to defer the sweep start event until a span
	// has actually been swept.
	maySweep bool

	// inSweep indicates that at least one sweep event has been traced.
	inSweep bool

	// swept and reclaimed track the number of bytes swept and reclaimed
	// by sweeping in the current sweep loop (while maySweep was true).
	swept, reclaimed uintptr
}

	// to sweep N.
	//
	// 2. In sweep N, help with sweep N.
	//
	// At this point we can begin a full cycle N+1.
	//
	// 3. Trigger cycle N+1 by starting sweep termination N+1.
	//
	// 4. Wait for mark termination N+1 to complete.
	//
	// 5. Help with sweep N+1 until it's done.
	//
	// This all has to be written to deal with the fact that the
	// GC may move ahead on its own. For example, when we block

	if size+_PageSize < size {
		throw("out of memory")
	}
	npages := size >> _PageShift
	if size&_PageMask != 0 {
		npages++
	}

	// Deduct credit for this span allocation and sweep if
	// necessary. mHeap_Alloc will also sweep npages, so this only
	// pays the debt down to npage pages.
	deductSweepCredit(npages*_PageSize, npages)

	spc := makeSpanClass(0, noscan)
	s := mheap_.alloc(npages, spc)
	if s == nil {