diff --git a/src/rules/isIn.ts b/src/rules/isIn.ts
index a0ad8d1..7e032c6 100644
--- a/src/rules/isIn.ts
+++ b/src/rules/isIn.ts
@@ -1,5 +1,15 @@
-export default (value: any, options: any[] | string): boolean => {
-  const list: any[] = Array.isArray(options) ? options : options.split(",");
+export default (value: any, ...args: any[]): boolean => {
+  // Let's check the last item is IContext
+  const lastItem: any = args.at(-1);
+  if (lastItem.definition && lastItem.field) {
+    args.pop();
+  }
+
+  const [options] = args;
+
+  const list: any[] = Array.isArray(options)
+    ? options
+    : (options as string).split(",");
   const listAsString = list.map((item) => String(item).trim());
 
   if (Array.isArray(value)) {
diff --git a/tests/rules/in.test.ts b/tests/rules/in.test.ts
index 73e514f..69189f9 100644
--- a/tests/rules/in.test.ts
+++ b/tests/rules/in.test.ts
@@ -43,5 +43,18 @@ describe("isIn() ", () => {
 
   it("should be able to parse string values", async () => {
     expect(isIn("A", "A,B,B")).toBe(true);
+    expect(isIn("B", "A,B,C")).toBe(true);
+    expect(isIn("C", "A,B,C")).toBe(true);
+    expect(isIn("D", "A,B,C")).toBe(false);
+
+    expect(isIn("a", ["a", "b", "c"])).toBe(true);
+    expect(isIn("b", ["a", "b", "c"])).toBe(true);
+    expect(isIn("c", ["a", "b", "c"])).toBe(true);
+    expect(isIn("d", ["a", "b", "c"])).toBe(false);
+  });
+
+  it("should be able to work with spread-string options", async () => {
+    expect(isIn("A", ...["A,B,B"])).toBe(true);
+    expect(isIn("A", ...["A", "B", "C"])).toBe(true);
   });
 });