diff --git a/exercises/practice/sublist/.meta/config.json b/exercises/practice/sublist/.meta/config.json
index 064b6ac888..502e8e0c84 100644
--- a/exercises/practice/sublist/.meta/config.json
+++ b/exercises/practice/sublist/.meta/config.json
@@ -4,6 +4,8 @@
   ],
   "contributors": [
     "ankorGH",
+    "atk",
+    "jagdish-15",
     "rchavarria",
     "SleeplessByte",
     "tejasbubane",
diff --git a/exercises/practice/sublist/.meta/proof.ci.js b/exercises/practice/sublist/.meta/proof.ci.js
index b6ceb8fe8d..10d49b49a7 100644
--- a/exercises/practice/sublist/.meta/proof.ci.js
+++ b/exercises/practice/sublist/.meta/proof.ci.js
@@ -1,21 +1,19 @@
 export class List {
-  constructor(list = []) {
-    this.list = list;
+  items = [];
+
+  constructor(...items) {
+    this.items = items;
   }
 
   compare(other) {
-    return {
-      '-1': isSublist(other.list, this.list) ? 'SUBLIST' : 'UNEQUAL',
-      0: isSublist(other.list, this.list) ? 'EQUAL' : 'UNEQUAL',
-      1: isSublist(this.list, other.list) ? 'SUPERLIST' : 'UNEQUAL',
-    }[lengthDiff(this, other)];
+    const sublist =
+      this.items.length === 0 ||
+      `,${other.items.join(',')},`.includes(`,${this.items.join(',')},`);
+    const superlist =
+      other.items.length === 0 ||
+      `,${this.items.join(',')},`.includes(`,${other.items.join(',')},`);
+    return ['UNEQUAL', 'SUPERLIST', 'SUBLIST', 'EQUAL'][
+      +superlist + (+sublist << 1)
+    ];
   }
 }
-
-function lengthDiff(one, two) {
-  return String(Math.sign(one.list.length - two.list.length));
-}
-
-function isSublist(one, two) {
-  return one.join().match(two.join());
-}
diff --git a/exercises/practice/sublist/.meta/tests.toml b/exercises/practice/sublist/.meta/tests.toml
index 74bd60cce7..de5020a9dd 100644
--- a/exercises/practice/sublist/.meta/tests.toml
+++ b/exercises/practice/sublist/.meta/tests.toml
@@ -1,6 +1,13 @@
-# This is an auto-generated file. Regular comments will be removed when this
-# file is regenerated. Regenerating will not touch any manually added keys,
-# so comments can be added in a "comment" key.
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
 
 [97319c93-ebc5-47ab-a022-02a1980e1d29]
 description = "empty lists"
@@ -47,6 +54,9 @@ description = "first list missing element from second list"
 [83ffe6d8-a445-4a3c-8795-1e51a95e65c3]
 description = "second list missing element from first list"
 
+[7bc76cb8-5003-49ca-bc47-cdfbe6c2bb89]
+description = "first list missing additional digits from second list"
+
 [0d7ee7c1-0347-45c8-9ef5-b88db152b30b]
 description = "order matters to a list"
 
diff --git a/exercises/practice/sublist/sublist.spec.js b/exercises/practice/sublist/sublist.spec.js
index 227019e890..e290fc1de9 100644
--- a/exercises/practice/sublist/sublist.spec.js
+++ b/exercises/practice/sublist/sublist.spec.js
@@ -107,6 +107,13 @@ describe('sublist', () => {
     expect(listOne.compare(listTwo)).toEqual('UNEQUAL');
   });
 
+  xtest('first list missing additional digits from second list', () => {
+    const listOne = new List([1, 2]);
+    const listTwo = new List([1, 22]);
+
+    expect(listOne.compare(listTwo)).toEqual('UNEQUAL');
+  });
+
   xtest('order matters to a list', () => {
     const listOne = new List([1, 2, 3]);
     const listTwo = new List([3, 2, 1]);