fix: compare BigInts during deep equality

index.js

@@ -214,6 +214,7 @@ function extensiveDeepEqualByType(leftHandOperand, rightHandOperand, leftHandTyp
     case 'Number':
     case 'Boolean':
     case 'Date':
+    case 'BigInt':
       // If these types are their instance types (e.g. `new Number`) then re-deepEqual against their values
       return deepEqual(leftHandOperand.valueOf(), rightHandOperand.valueOf());
     case 'Promise':

test/index.js

@@ -131,6 +131,31 @@ describe('Generic', function () {
 
   });
 
+  describe('BigInt', function () {
+
+    it('returns true for same values', function () {
+      assert(eql(BigInt(1), BigInt(1)), 'eql(BigInt(1), BigInt(1))');
+      assert(eql(Object(BigInt(1)), Object(BigInt(1))), 'eql(Object(BigInt(1)), Object(BigInt(1)))');
+    });
+
+    it('returns false for literal vs instance with same value', function () {
+      assert(eql(BigInt(1), Object(BigInt(1))) === false, 'eql(BigInt(1), Object(BigInt(1))) === false');
+    });
+
+    it('returns false on numbers with different signs', function () {
+      assert(eql(BigInt(-1), BigInt(1)) === false, 'eql(BigInt(-1), BigInt(1)) === false');
+    });
+
+    it('returns false on instances with different signs', function () {
+      assert(eql(Object(BigInt(-1)), Object(BigInt(1))) === false, 'eql(Object(BigInt(-1)), Object(BigInt(1))) === false');
+    });
+
+    it('returns false for literal vs number with same value', function () {
+      assert(eql(BigInt(1), 1) === false, 'eql(BigInt(1), 1) === false');
+    });
+
+  });
+
   describe('dates', function () {
 
     it('returns true given two dates with the same time', function () {