diff --git a/compiler.js b/compiler.js
index 1cc56dd..dc85183 100644
--- a/compiler.js
+++ b/compiler.js
@@ -36,12 +36,13 @@ import asyncIterators from './async_iterators.js'
  * @param {*} x
  * @returns
  */
-function isPrimitive (x) {
+function isPrimitive (x, preserveObject) {
   if (typeof x === 'number' && (x === Infinity || x === -Infinity || Number.isNaN(x))) return false
   return (
     x === null ||
     x === undefined ||
-    ['Number', 'String', 'Boolean', 'Object'].includes(x.constructor.name)
+    ['Number', 'String', 'Boolean'].includes(x.constructor.name) ||
+    (!preserveObject && x.constructor.name === 'Object')
   )
 }
 
@@ -245,8 +246,8 @@ function buildString (method, buildState = {}) {
     values = [],
     engine
   } = buildState
-  function pushValue (value) {
-    if (isPrimitive(value)) return JSON.stringify(value)
+  function pushValue (value, preserveObject = false) {
+    if (isPrimitive(value, preserveObject)) return JSON.stringify(value)
     values.push(value)
     return `values[${values.length - 1}]`
   }
@@ -273,7 +274,7 @@ function buildString (method, buildState = {}) {
   if (method && typeof method === 'object') {
     if (!engine.methods[func]) {
       // If we are in permissive mode, we will just return the object.
-      if (engine.options.permissive) return pushValue(method)
+      if (engine.options.permissive) return pushValue(method, true)
       throw new Error(`Method '${func}' was not found in the Logic Engine.`)
     }
     functions[func] = functions[func] || 2
@@ -284,7 +285,7 @@ function buildString (method, buildState = {}) {
       isDeterministic(method, engine, buildState)
     ) {
       if (isDeepSync(method, engine)) {
-        return pushValue((engine.fallback || engine).run(method))
+        return pushValue((engine.fallback || engine).run(method), true)
       } else if (!buildState.avoidInlineAsync) {
         processing.push(engine.run(method).then((i) => pushValue(i)))
         return `__%%%${processing.length - 1}%%%__`
diff --git a/general.test.js b/general.test.js
index 6096500..94dde7b 100644
--- a/general.test.js
+++ b/general.test.js
@@ -16,7 +16,7 @@ const permissiveEngines = [
   new AsyncLogicEngine(undefined, { yieldSupported: true, permissive: true })
 ]
 
-async function testEngineAsync (engine, rule, data, expected) {
+async function testEngineAsync (engine, rule, data, expected, matcher = 'deepStrictEqual') {
   // run
   if (expected === Error) {
     try {
@@ -25,7 +25,7 @@ async function testEngineAsync (engine, rule, data, expected) {
     } catch (e) {}
   } else {
     const result = await engine.run(rule, data)
-    assert.deepStrictEqual(result, expected)
+    assert[matcher](result, expected)
   }
 
   // build
@@ -38,13 +38,13 @@ async function testEngineAsync (engine, rule, data, expected) {
   } else {
     const built = await engine.build(rule)
     const builtResult = await built(data)
-    assert.deepStrictEqual(builtResult, expected)
+    assert[matcher](builtResult, expected)
   }
 }
 
-function testEngine (engine, rule, data, expected) {
+function testEngine (engine, rule, data, expected, matcher = 'deepStrictEqual') {
   if (engine instanceof AsyncLogicEngine) {
-    return testEngineAsync(engine, rule, data, expected)
+    return testEngineAsync(engine, rule, data, expected, matcher)
   }
 
   // run
@@ -55,7 +55,7 @@ function testEngine (engine, rule, data, expected) {
     } catch (e) {}
   } else {
     const result = engine.run(rule, data)
-    assert.deepStrictEqual(result, expected)
+    assert[matcher](result, expected)
   }
 
   // build
@@ -68,7 +68,7 @@ function testEngine (engine, rule, data, expected) {
   } else {
     const built = engine.build(rule)
     const builtResult = built(data)
-    assert.deepStrictEqual(builtResult, expected)
+    assert[matcher](builtResult, expected)
   }
 }
 
@@ -84,6 +84,20 @@ describe('Various Test Cases', () => {
       await testEngine(engine, {
         if: [true, { unknown: true, unknown2: 2 }, 5]
       }, {}, { unknown: true, unknown2: 2 })
+
+      const obj = { unknown: true, unknown2: 2 }
+
+      // test with deterministic function returning a passively preserved element.
+      await testEngine(engine, {
+        if: [true, obj, 5]
+      }, {}, obj, 'equal')
+
+      // test with a non-deterministic function returning a passively preserved element.
+      await testEngine(engine, {
+        if: [{ var: 'data' }, obj, 5]
+      }, {
+        data: true
+      }, obj, 'equal')
     }
   })
 })
diff --git a/package.json b/package.json
index e08b02c..33c805a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "json-logic-engine",
-  "version": "1.2.2",
+  "version": "1.2.3",
   "description": "Construct complex rules with JSON & process them.",
   "main": "./dist/cjs/index.js",
   "module": "./dist/esm/index.js",