diff --git a/lib/configly.js b/lib/configly.js
index bfe4b2a..acac9d5 100644
--- a/lib/configly.js
+++ b/lib/configly.js
@@ -1,4 +1,4 @@
-var merge       = require('deeply')
+var clone       = require('deeply')
   , getCacheKey = require('./get_cache_key.js')
   ;
 
@@ -19,7 +19,7 @@ function configly(options)
 
   // create new running context with custom options
   // fallback to default directories
-  context = this.new(merge(options || {}));
+  context = this.new(clone(options || {}));
 
   // prepare cache key
   cacheKey = getCacheKey.call(context);
@@ -31,5 +31,8 @@ function configly(options)
 
   // return immutable copy
   // always return object here
-  return merge(this._cache[cacheKey] || {});
+  return clone.call({
+    useCustomTypeOf: clone.behaviors.useCustomTypeOf,
+    'typeof': context.mergeTypeOf
+  }, this._cache[cacheKey] || {});
 }
diff --git a/test/fixtures/expected/env_vars_modifiers_custom.js b/test/fixtures/expected/env_vars_modifiers_custom.js
index c2c7e1d..11ceb2d 100644
--- a/test/fixtures/expected/env_vars_modifiers_custom.js
+++ b/test/fixtures/expected/env_vars_modifiers_custom.js
@@ -1,7 +1,7 @@
 var moment = require('moment');
 
 var datetime = moment.utc('2016-01-01T00:00:00');
-var date = new Date('Fri Jan 01 2016 00:00:00 GMT-0800');
+var date = new Date('Fri Jan 01 2016 00:00:00');
 var combinedDate = new Date('Thu Dec 31 2015 16:00:00 GMT-0800');
 
 module.exports = {
diff --git a/test/test-env_vars_modifiers.js b/test/test-env_vars_modifiers.js
index adb62f6..ffcb6be 100644
--- a/test/test-env_vars_modifiers.js
+++ b/test/test-env_vars_modifiers.js
@@ -51,5 +51,6 @@ test('treated environment variables with modifiers', function(t)
   delete process.env['WITHOUT_ENV'];
 
   configObj = config({ directories: configDir });
+
   t.deepEqual(configObj, expected, 'expects to get right config object');
 });