Check if bigints work

Author: forki

src/tests/Main/ArithmeticTests.fs

@@ -210,3 +210,9 @@ let ``System.Random works``() =
     let rnd = System.Random()
     let x = rnd.Next(5)
     Assert.AreEqual(true, x >= 0 && x < 5)
+
+[<Test>]
+let ``bigint equality works``() =
+    let a = 9007199254740992I
+    let b = 9007199254740993I
+    Assert.AreNotEqual(a, b)