Use BoxesRunTime.equals for ArraySeq comparison

Add BoxesRunTime.arraysEquals, which uses
BoxesRunTime.equals to compare array elements.

Use BoxesRunTime.arraysEquals for ArraySeq.ofRef[_]#equals.

Author: NthPortal

library/src/scala/collection/immutable/ArraySeq.scala

@@ -9,7 +9,7 @@ import scala.collection.IterableOnce
 import scala.annotation.unchecked.uncheckedVariance
 import scala.util.hashing.MurmurHash3
 import scala.reflect.ClassTag
-import scala.runtime.ScalaRunTime
+import scala.runtime.{BoxesRunTime, ScalaRunTime}
 import java.util.Arrays
 
 /**
@@ -229,8 +229,11 @@ object ArraySeq extends StrictOptimizedClassTagSeqFactory[ArraySeq] { self =>
     @throws[ArrayIndexOutOfBoundsException]
     def apply(i: Int): T = unsafeArray(i)
     override def hashCode = MurmurHash3.arrayHash(unsafeArray, MurmurHash3.seqSeed)
-    override def equals(that: Any) = that match {
-      case that: ofRef[_] => Arrays.equals(unsafeArray.asInstanceOf[Array[AnyRef]], that.unsafeArray.asInstanceOf[Array[AnyRef]])
+    override def equals(that: Any): Boolean = that match {
+      case that: ofRef[_] =>
+        BoxesRunTime.arraysEquals(
+          this.unsafeArray.asInstanceOf[Array[AnyRef]],
+          that.unsafeArray.asInstanceOf[Array[AnyRef]])
       case _ => super.equals(that)
     }
   }

library/src/scala/collection/mutable/ArraySeq.scala

@@ -3,7 +3,7 @@ package mutable
 
 import java.io.{ObjectInputStream, ObjectOutputStream}
 
-import scala.runtime.ScalaRunTime
+import scala.runtime.{BoxesRunTime, ScalaRunTime}
 import scala.reflect.ClassTag
 import scala.util.hashing.MurmurHash3
 import java.util.Arrays
@@ -144,7 +144,10 @@ object ArraySeq extends StrictOptimizedClassTagSeqFactory[ArraySeq] { self =>
     def update(index: Int, elem: T): Unit = { array(index) = elem }
     override def hashCode = MurmurHash3.arraySeqHash(array)
     override def equals(that: Any) = that match {
-      case that: ofRef[_] => Arrays.equals(array.asInstanceOf[Array[AnyRef]], that.array.asInstanceOf[Array[AnyRef]])
+      case that: ofRef[_] =>
+        BoxesRunTime.arraysEquals(
+          this.array.asInstanceOf[Array[AnyRef]],
+          that.array.asInstanceOf[Array[AnyRef]])
       case _ => super.equals(that)
     }
   }

library/src/scala/runtime/BoxesRunTime.java

@@ -198,6 +198,20 @@ public static boolean equalsNumChar(java.lang.Number xn, java.lang.Character yc)
         }
     }
 
+    public static boolean arraysEquals(Object[] xs, Object[] ys) {
+        if (xs == ys)
+            return true;
+        if (xs.length != ys.length)
+            return false;
+
+        int len = xs.length;
+        for (int i = 0; i < len; i++) {
+            if (!equals(xs[i], ys[i]))
+                return false;
+        }
+        return true;
+    }
+
     private static int unboxCharOrInt(Object arg1, int code) {
       if (code == CHAR)
         return ((java.lang.Character) arg1).charValue();