Add PlotRangeIterator for the many places where it'll be used. All one of them, in fact. This was not a waste of time. I am very happy I did this. This was worthwhile. Yup.

Bukkit/src/main/java/com/plotsquared/bukkit/entity/ReplicatingEntityWrapper.java

@@ -154,7 +154,7 @@ public final class ReplicatingEntityWrapper extends EntityWrapper {
             case "ITEM_FRAME":
                 this.x = Math.floor(this.getX());
                 this.y = Math.floor(this.getY());
-                this.z = Math.floor(this.z);
+                this.z = Math.floor(this.getZ());
                 ItemFrame itemFrame = (ItemFrame) entity;
                 this.dataByte = getOrdinal(Rotation.values(), itemFrame.getRotation());
                 this.stack = itemFrame.getItem().clone();
@@ -162,7 +162,7 @@ public final class ReplicatingEntityWrapper extends EntityWrapper {
             case "PAINTING":
                 this.x = Math.floor(this.getX());
                 this.y = Math.floor(this.getY());
-                this.z = Math.floor(this.z);
+                this.z = Math.floor(this.getZ());
                 Painting painting = (Painting) entity;
                 Art art = painting.getArt();
                 this.dataByte = getOrdinal(BlockFace.values(), painting.getFacing());
@@ -409,7 +409,7 @@ public final class ReplicatingEntityWrapper extends EntityWrapper {
             Location location = lived.getLeashHolder().getLocation();
             this.lived.leashX = (short) (this.getX() - location.getBlockX());
             this.lived.leashY = (short) (this.getY() - location.getBlockY());
-            this.lived.leashZ = (short) (this.z - location.getBlockZ());
+            this.lived.leashZ = (short) (this.getZ() - location.getBlockZ());
         }
         EntityEquipment equipment = lived.getEquipment();
         this.lived.equipped = equipment != null;

Bukkit/src/main/java/com/plotsquared/bukkit/entity/TeleportEntityWrapper.java

@@ -69,7 +69,7 @@ public class TeleportEntityWrapper extends EntityWrapper {
         this.oldLocation = oldLocation.clone();
         this.oldLocation.setX(this.getX());
         this.oldLocation.setY(this.getY());
-        this.oldLocation.setZ(this.z);
+        this.oldLocation.setZ(this.getZ());
 
         this.gravityOld = this.getEntity().hasGravity();
         this.getEntity().setGravity(false);

Core/src/main/java/com/plotsquared/core/command/Auto.java

@@ -298,16 +298,15 @@ public class Auto extends SubCommand {
                 PlotId end = PlotId.of(start.getX() + size_x - 1, start.getY() + size_z - 1);
                 if (plotarea.canClaim(player, start, end)) {
                     plotarea.setMeta("lastPlot", start);
-                    for (int i = start.getX(); i <= end.getX(); i++) {
-                        for (int j = start.getY(); j <= end.getY(); j++) {
-                            Plot plot = plotarea.getPlotAbs(PlotId.of(i, j));
-                            boolean teleport = i == end.getX() && j == end.getY();
-                            if (plot == null) {
-                                return false;
-                            }
-                            plot.claim(player, teleport, null);
+
+                    for (final PlotId plotId : PlotId.PlotRangeIterator.range(start, end)) {
+                        final Plot plot = plotarea.getPlot(plotId);
+                        if (plot == null) {
+                            return false;
                         }
+                        plot.claim(player, plotId.equals(end), null);
                     }
+
                     ArrayList<PlotId> plotIds = MainUtil.getPlotSelectionIds(start, end);
                     final PlotId pos1 = plotIds.get(0);
                     final PlotAutoMergeEvent mergeEvent = this.eventDispatcher

Core/src/main/java/com/plotsquared/core/location/PlotLoc.java

@@ -92,7 +92,7 @@ public final class PlotLoc {
         int result = 1;
         result = (prime * result) + this.getX();
         result = (prime * result) + this.getY();
-        result = (prime * result) + this.z;
+        result = (prime * result) + this.getZ();
         return result;
     }
 
@@ -111,6 +111,7 @@ public final class PlotLoc {
             return false;
         }
         final PlotLoc other = (PlotLoc) obj;
-        return (this.getX() == other.getX()) && (this.getY() == other.getY()) && (this.z == other.z);
+        return (this.getX() == other.getX()) && (this.getY() ==
+            other.getY()) && (this.getZ() == other.getZ());
     }
 }

Core/src/main/java/com/plotsquared/core/plot/PlotId.java

@@ -30,6 +30,7 @@ import org.jetbrains.annotations.NotNull;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
+import java.util.Iterator;
 
 /**
  * Plot (X,Y) tuples for plot locations
@@ -242,4 +243,53 @@ public class PlotId {
         return this.hash;
     }
 
+
+    public static final class PlotRangeIterator implements Iterator<PlotId>, Iterable<PlotId> {
+
+        private final PlotId start;
+        private final PlotId end;
+
+        private int x;
+        private int y;
+
+        private PlotRangeIterator(@Nonnull final PlotId start, @Nonnull final PlotId end) {
+            this.start = start;
+            this.end = end;
+            this.x = this.start.getX();
+            this.y = this.start.getY();
+        }
+
+        public static PlotRangeIterator range(@Nonnull final PlotId start, @Nonnull final PlotId end) {
+            return new PlotRangeIterator(start, end);
+        }
+
+        @Override public boolean hasNext() {
+            if (this.x < this.end.getX()) {
+                return true;
+            } else if (this.x == this.end.getX()) {
+                return this.y < this.end.getY();
+            } else {
+                return false;
+            }
+        }
+
+        @Override public PlotId next() {
+            if (!hasNext()) {
+               throw new IndexOutOfBoundsException("The iterator has no more entries");
+            }
+            if (this.y == this.end.getY()) {
+                this.x++;
+                this.y = 0;
+            } else {
+                this.y++;
+            }
+            return PlotId.of(this.start.getX() + this.x, this.start.getY() + this.y);
+        }
+
+        @Nonnull @Override public Iterator<PlotId> iterator() {
+            return this;
+        }
+
+    }
+
 }