diff --git a/lib/contain.js b/lib/contain.js
index 9afc464e..920d9d49 100755
--- a/lib/contain.js
+++ b/lib/contain.js
@@ -192,7 +192,7 @@ internals.object = function (ref, values, options) {
     }
 
     if (set.size) {
-        return !!options.part;
+        return options.part ? set.size < targets.length : false;
     }
 
     return true;
@@ -254,7 +254,12 @@ internals.string = function (ref, values, options) {
         return false;
     }
 
+    let any = false;
     for (const match of map.values()) {
+        if (match.hits) {
+            any = true;
+        }
+
         if (match.hits === match.allowed) {
             continue;
         }
@@ -272,7 +277,7 @@ internals.string = function (ref, values, options) {
         }
     }
 
-    return true;
+    return !!any;
 };
 
 
diff --git a/test/index.js b/test/index.js
index d2ab0419..516eb846 100755
--- a/test/index.js
+++ b/test/index.js
@@ -2136,6 +2136,9 @@ describe('contain()', () => {
         expect(Hoek.contain('ab', ['a', 'b', 'c'])).to.be.false();
         expect(Hoek.contain('ab', ['a', 'b', 'c'], { only: true })).to.be.false();
         expect(Hoek.contain('ab', ['a', 'b', 'c'], { only: true, once: true })).to.be.false();
+
+        expect(Hoek.contain('ab', ['c'], { part: true })).to.be.false();
+        expect(Hoek.contain('ab', ['b'], { part: true })).to.be.true();
     });
 
     it('tests arrays', () => {
@@ -2182,6 +2185,9 @@ describe('contain()', () => {
         expect(Hoek.contain(['a', 'b'], ['a', 'b', 'c'])).to.be.false();
         expect(Hoek.contain(['a', 'b'], ['a', 'b', 'c'], { only: true })).to.be.false();
         expect(Hoek.contain(['a', 'b'], ['a', 'b', 'c'], { only: true, once: true })).to.be.false();
+
+        expect(Hoek.contain(['a', 'b'], ['c'], { part: true })).to.be.false();
+        expect(Hoek.contain(['a', 'b'], ['b'], { part: true })).to.be.true();
     });
 
     it('tests objects', () => {
@@ -2226,6 +2232,9 @@ describe('contain()', () => {
         expect(Hoek.contain({ a: 'foo', b: 'bar' }, { a: 'foo', b: 'bar', c: 'x' })).to.be.false();
         expect(Hoek.contain({ a: 'foo', b: 'bar' }, { a: 'foo', b: 'bar', c: 'x' }, { only: true })).to.be.false();
 
+        expect(Hoek.contain({ a: 1, b: 2 }, ['c'], { part: true })).to.be.false();
+        expect(Hoek.contain({ a: 1, b: 2 }, ['b'], { part: true })).to.be.true();
+
         // Getter check
 
         {
@@ -2314,6 +2323,21 @@ describe('contain()', () => {
         expect(Hoek.contain([sym], Symbol())).to.be.false();
         expect(Hoek.contain({ [sym]: 1 }, Symbol())).to.be.false();
     });
+
+    it('compares error keys', () => {
+
+        const error = new Error('test');
+        expect(Hoek.contain(error, { x: 1 })).to.be.false();
+        expect(Hoek.contain(error, { x: 1 }, { part: true })).to.be.false();
+
+        error.x = 1;
+
+        expect(Hoek.contain(error, { x: 1 })).to.be.true();
+        expect(Hoek.contain(error, { x: 1 }, { part: true })).to.be.true();
+
+        expect(Hoek.contain(error, { x: 1, y: 2 })).to.be.false();
+        expect(Hoek.contain(error, { x: 1, y: 2 }, { part: true })).to.be.true();
+    });
 });
 
 describe('flatten()', () => {