Regular expressions not merged

[dannyshaw]

Apologies if this is expected behavior but I am not seeing regular expressions come through merges.
Seeing the following behavior in 0.2.10 fresh install from npm

var deepmerge = require('deepmerge');

var obj1 = {
  test: /\.js?$/,
}

var obj2 = {
  test: /\.jsx?$/,
}

console.log(obj1.test.test('file.js'));
console.log(obj2.test.test('file.jsx'));

var result = deepmerge(obj1, obj2);

console.log(result.test.test('file.js'));
console.log(result.test.test('file.jsx'));

$ node deepmergetest.js 
true
true
/home/danny/bm/pub/scratch/deepmergetest.js:18
console.log(result.test.test('file.js'));
                        ^
TypeError: undefined is not a function
    at Object.<anonymous> (/home/danny/bm/pub/scratch/deepmergetest.js:18:25)
    at Module._compile (module.js:460:26)
    at Object.Module._extensions..js (module.js:478:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Function.Module.runMain (module.js:501:10)
    at startup (node.js:129:16)
    at node.js:814:3