zio.Differ::patch seems to introduce boxing around integer

[guizmaii]

In some CPU profiling of the benchmarks we run on our Consumer wrapping zio-kafka's Consumer, we can see this:

--- 10000000 ns (0.18%), 1 sample
  [ 0] scala.runtime.BoxesRunTime.boxToInteger
  [ 1] zio.Differ$$anon$8.patch
  [ 2] zio.FiberRef$unsafe$$anon$2.patch
  [ 3] zio.FiberRefs.$anonfun$forkAs$1
  [ 4] zio.FiberRefs$$Lambda$134.0x0000000800d59280.apply
  [ 5] scala.collection.immutable.Map$Map4.transform
  [ 6] scala.collection.immutable.Map$Map4.transform
  [ 7] zio.FiberRefs.forkAs
  [ 8] zio.ZIO$unsafe$.makeChildFiber
  [ 9] zio.ZIO$unsafe$.fork
  [10] zio.ZIO.$anonfun$forkWithScopeOverride$2
  [11] zio.ZIO$$Lambda$325.0x0000000800dd8800.apply
  [12] zio.internal.FiberRuntime.runLoop
  [13] zio.internal.FiberRuntime.runLoop
  [14] zio.internal.FiberRuntime.runLoop
  [15] zio.internal.FiberRuntime.runLoop
  [16] zio.internal.FiberRuntime.runLoop
  [17] zio.internal.FiberRuntime.runLoop
  [18] zio.internal.FiberRuntime.evaluateEffect
  [19] zio.internal.FiberRuntime.evaluateMessageWhileSuspended
  [20] zio.internal.FiberRuntime.drainQueueOnCurrentThread
  [21] zio.internal.FiberRuntime.run
  [22] zio.internal.ZScheduler$$anon$4.run

[adamgfraser]

@guizmaii What FiberRefs are you creating?

[guizmaii]

We're not creating any FiberRef manually so I guess, the default ones.

How can I get this information?

[adamgfraser]

A minimized reproducer, ideally only using ZIO, would be helpful.

[guizmaii]

I'll see what I can do. Not sure it's easily isolatable