[Refactor] add strict pragma; remove unused try/catch

.eslintrc

@@ -12,7 +12,6 @@
     "new-cap": [2, { "capIsNewExceptions": ["GetIntrinsic"] }],
     "no-magic-numbers": [2, { "ignore": [0, 1] }],
     "operator-linebreak": [2, "before"],
-    "strict": 1,
   },
   "globals": {
     "WeakMap": false,

assert.js

@@ -1 +1,3 @@
+'use strict';
+
 module.exports = require('assert');

example/cmp.js

@@ -1,3 +1,5 @@
+'use strict';
+
 var equal = require('../');
 console.dir([
   equal(

index.js

@@ -1,3 +1,5 @@
+'use strict';
+
 var objectKeys = require('object-keys');
 var isArguments = require('is-arguments');
 var is = require('object-is');
@@ -315,12 +317,8 @@ function objEquiv(a, b, opts, channel) {
 
   if (typeof a !== typeof b) { return false; }
 
-  try {
-    var ka = objectKeys(a);
-    var kb = objectKeys(b);
-  } catch (e) { // happens when one is a string literal and the other isn't
-    return false;
-  }
+  var ka = objectKeys(a);
+  var kb = objectKeys(b);
   // having the same number of owned properties (keys incorporates hasOwnProperty)
   if (ka.length !== kb.length) { return false; }
 

test/_tape.js

@@ -1,3 +1,5 @@
+'use strict';
+
 var Test = require('tape/lib/test');
 var is = require('object-is');
 

test/cmp.js

@@ -1,3 +1,5 @@
+'use strict';
+
 var test = require('tape');
 require('./_tape');
 var assign = require('object.assign');