Actually, just kill the crazy MyCrazyReferences idea

librarymanagement/src/main/scala/sbt/internal/librarymanagement/formats/DependencyResolverFormat.scala

@@ -4,9 +4,5 @@ import sjsonnew._
 import org.apache.ivy.plugins.resolver.DependencyResolver
 
 trait DependencyResolverFormat { self: BasicJsonProtocol =>
-  implicit lazy val DependencyResolverFormat: JsonFormat[DependencyResolver] =
-    project(
-      MyCrazyReferences.referenced _,
-      (ref: String) => MyCrazyReferences(ref, classOf[DependencyResolver])
-    )
+  implicit lazy val DependencyResolverFormat: JsonFormat[DependencyResolver] = ???
 }

librarymanagement/src/main/scala/sbt/internal/librarymanagement/formats/GlobalLockFormat.scala

@@ -4,6 +4,5 @@ import sjsonnew._
 import xsbti._
 
 trait GlobalLockFormat { self: BasicJsonProtocol =>
-  implicit lazy val GlobalLockFormat: JsonFormat[GlobalLock] =
-    project(MyCrazyReferences.referenced _, (ref: String) => MyCrazyReferences(ref, classOf[GlobalLock]))
+  implicit lazy val GlobalLockFormat: JsonFormat[GlobalLock] = ???
 }

librarymanagement/src/main/scala/sbt/internal/librarymanagement/formats/LoggerFormat.scala

@@ -4,6 +4,5 @@ import sjsonnew._
 import xsbti._
 
 trait LoggerFormat { self: BasicJsonProtocol =>
-  implicit lazy val LoggerFormat: JsonFormat[Logger] =
-    project(MyCrazyReferences.referenced _, (ref: String) => MyCrazyReferences(ref, classOf[Logger]))
+  implicit lazy val LoggerFormat: JsonFormat[Logger] = ???
 }

librarymanagement/src/main/scala/sbt/internal/librarymanagement/formats/MyCrazyReferences.scala

@@ -1,15 +0,0 @@
-package sbt.internal.librarymanagement.formats
-
-import scala.collection.mutable
-
-object MyCrazyReferences {
-  private val references: mutable.Map[String, Any] = mutable.Map.empty
-
-  def apply[T](key: String, clazz: Class[T]): T = synchronized(clazz.cast(references(key)))
-
-  def referenced[T](value: T): String = synchronized {
-    val key = java.util.UUID.randomUUID.toString
-    references(key) = value
-    key
-  }
-}

librarymanagement/src/main/scala/sbt/internal/librarymanagement/formats/NodeSeqFormat.scala

@@ -4,6 +4,5 @@ import sjsonnew._
 import scala.xml._
 
 trait NodeSeqFormat { self: BasicJsonProtocol =>
-  implicit lazy val NodeSeqFormat: JsonFormat[NodeSeq] =
-    project(MyCrazyReferences.referenced _, (ref: String) => MyCrazyReferences(ref, classOf[NodeSeq]))
+  implicit lazy val NodeSeqFormat: JsonFormat[NodeSeq] = ???
 }