Logic fail.

Also, why did cur work when it should have been cur.ID?

builds/4chan-X.user.js

@@ -1500,11 +1500,12 @@
         return;
       }
       cur = start === 0 ? this.first : this[start];
-      while (cur !== this[end]) {
-        if (!(next = cur.next, cur)) {
+      while (cur) {
+        next = cur.next;
+        this.rm(cur.ID);
+        if (!next || cur.ID === end) {
           return;
         }
-        this.rm(cur);
         cur = next;
       }
     };
@@ -1517,7 +1518,9 @@
       }
       delete this[ID];
       this.length--;
-      return this.rmi(item);
+      this.rmi(item);
+      delete item.next;
+      return delete item.previous;
     };
 
     RandomAccessList.prototype.rmi = function(item) {

builds/crx/script.js

@@ -1506,11 +1506,12 @@
         return;
       }
       cur = start === 0 ? this.first : this[start];
-      while (cur !== this[end]) {
-        if (!(next = cur.next, cur)) {
+      while (cur) {
+        next = cur.next;
+        this.rm(cur.ID);
+        if (!next || cur.ID === end) {
           return;
         }
-        this.rm(cur);
         cur = next;
       }
     };
@@ -1523,7 +1524,9 @@
       }
       delete this[ID];
       this.length--;
-      return this.rmi(item);
+      this.rmi(item);
+      delete item.next;
+      return delete item.previous;
     };
 
     RandomAccessList.prototype.rmi = function(item) {

src/General/lib/randomaccesslist.class

@@ -34,9 +34,10 @@ class RandomAccessList
   splice: (start, end) ->
     return unless @[end]
     cur = if start is 0 then @first else @[start]
-    while cur isnt @[end]
-      return unless {next} = cur
-      @rm cur
+    while cur
+      {next} = cur
+      @rm cur.ID
+      return if not next or cur.ID is end
       cur = next
 
   rm: (ID) ->
@@ -45,6 +46,8 @@ class RandomAccessList
     delete @[ID]
     @length--
     @rmi item
+    delete item.next
+    delete item.previous
 
   rmi: (item) ->
     {prev, next} = item