[Robustness] use call-bind

index.js

@@ -1,15 +1,16 @@
 'use strict';
 
+var callBound = require('call-bind/callBound');
 var hasSymbols = require('has-symbols')();
 var hasToStringTag = hasSymbols && typeof Symbol.toStringTag === 'symbol';
-var hasOwnProperty;
-var regexExec;
+var has;
+var $exec;
 var isRegexMarker;
 var badStringifier;
 
 if (hasToStringTag) {
-	hasOwnProperty = Function.call.bind(Object.prototype.hasOwnProperty);
-	regexExec = Function.call.bind(RegExp.prototype.exec);
+	has = callBound('Object.prototype.hasOwnProperty');
+	$exec = callBound('RegExp.prototype.exec');
 	isRegexMarker = {};
 
 	var throwRegexMarker = function () {
@@ -25,7 +26,7 @@ if (hasToStringTag) {
 	}
 }
 
-var toStr = Object.prototype.toString;
+var $toString = callBound('Object.prototype.toString');
 var gOPD = Object.getOwnPropertyDescriptor;
 var regexClass = '[object RegExp]';
 
@@ -37,13 +38,13 @@ module.exports = hasToStringTag
 		}
 
 		var descriptor = gOPD(value, 'lastIndex');
-		var hasLastIndexDataProperty = descriptor && hasOwnProperty(descriptor, 'value');
+		var hasLastIndexDataProperty = descriptor && has(descriptor, 'value');
 		if (!hasLastIndexDataProperty) {
 			return false;
 		}
 
 		try {
-			regexExec(value, badStringifier);
+			$exec(value, badStringifier);
 		} catch (e) {
 			return e === isRegexMarker;
 		}
@@ -54,5 +55,5 @@ module.exports = hasToStringTag
 			return false;
 		}
 
-		return toStr.call(value) === regexClass;
+		return $toString(value) === regexClass;
 	};

package.json

@@ -37,6 +37,7 @@
 		"expression"
 	],
 	"dependencies": {
+		"call-bind": "^1.0.2",
 		"has-symbols": "^1.0.1"
 	},
 	"devDependencies": {