Do not use Object.create(null)

Reverts 032fbaf

Turns out this was a breaking change, because people relied on doing
`config.hasOwnProperty(blah)` with ini-returned objects.

Will re-land 032fbaf on a v2 release.

ini.js

@@ -18,7 +18,7 @@ function encode (obj, opt) {
       whitespace: false,
     }
   } else {
-    opt = opt || Object.create(null)
+    opt = opt || {}
     opt.whitespace = opt.whitespace === true
   }
 
@@ -65,7 +65,7 @@ function dotSplit (str) {
 }
 
 function decode (str) {
-  var out = Object.create(null)
+  var out = {}
   var p = out
   var section = null
   //          section     |key      = value
@@ -83,10 +83,10 @@ function decode (str) {
       if (section === '__proto__') {
         // not allowed
         // keep parsing the section, but don't attach it.
-        p = Object.create(null)
+        p = {}
         return
       }
-      p = out[section] = out[section] || Object.create(null)
+      p = out[section] = out[section] || {}
       return
     }
     var key = unsafe(match[2])
@@ -136,7 +136,7 @@ function decode (str) {
       if (part === '__proto__')
         return
       if (!p[part] || typeof p[part] !== 'object')
-        p[part] = Object.create(null)
+        p[part] = {}
       p = p[part]
     })
     if (p === out && nl === l)

test/proto.js

@@ -23,33 +23,33 @@ foo = asdfasdf
 
 var res = ini.parse(data)
 
-t.deepEqual(res, Object.assign(Object.create(null), {
+t.deepEqual(res, {
   'constructor.prototype.foo': 'asdfasdf',
   foo: 'baz',
-  other: Object.assign(Object.create(null), {
+  other: {
     foo: 'asdf',
-  }),
-  kid: Object.assign(Object.create(null), {
-    foo: Object.assign(Object.create(null), {
+  },
+  kid: {
+    foo: {
       foo: 'kid',
-    }),
-  }),
-  arrproto: Object.assign(Object.create(null), {
+    },
+  },
+  arrproto: {
     hello: 'snyk',
     thanks: true,
-  }),
-  ctor: Object.assign(Object.create(null), {
-    constructor: Object.assign(Object.create(null), {
-      prototype: Object.assign(Object.create(null), {
+  },
+  ctor: {
+    constructor: {
+      prototype: {
         foo: 'asdfasdf',
-      }),
-    }),
-  }),
-}))
-t.equal(res.__proto__, undefined)
-t.equal(res.kid.__proto__, undefined)
-t.equal(res.kid.foo.__proto__, undefined)
-t.equal(res.arrproto.__proto__, undefined)
+      },
+    },
+  },
+})
+t.equal(res.__proto__, Object.prototype)
+t.equal(res.kid.__proto__, Object.prototype)
+t.equal(res.kid.foo.__proto__, Object.prototype)
+t.equal(res.arrproto.__proto__, Object.prototype)
 t.equal(Object.prototype.foo, undefined)
 t.equal(Object.prototype[0], undefined)
 t.equal(Object.prototype['0'], undefined)