perf(toNumber): use +value to convert binary/octal/hexadecimal string (#4230)

lodash.js

@@ -177,18 +177,9 @@
   /** Used to match `RegExp` flags from their coerced string values. */
   var reFlags = /\w*$/;
 
-  /** Used to detect bad signed hexadecimal string values. */
-  var reIsBadHex = /^[-+]0x[0-9a-f]+$/i;
-
-  /** Used to detect binary string values. */
-  var reIsBinary = /^0b[01]+$/i;
-
   /** Used to detect host constructors (Safari). */
   var reIsHostCtor = /^\[object .+?Constructor\]$/;
 
-  /** Used to detect octal string values. */
-  var reIsOctal = /^0o[0-7]+$/i;
-
   /** Used to detect unsigned integer values. */
   var reIsUint = /^(?:0|[1-9]\d*)$/;
 
@@ -409,8 +400,7 @@
   };
 
   /** Built-in method references without a dependency on `root`. */
-  var freeParseFloat = parseFloat,
-      freeParseInt = parseInt;
+  var freeParseFloat = parseFloat;
 
   /** Detect free variable `global` from Node.js. */
   var freeGlobal = typeof global == 'object' && global && global.Object === Object && global;
@@ -12464,11 +12454,7 @@
       if (typeof value != 'string') {
         return value === 0 ? value : +value;
       }
-      value = value.replace(reTrim, '');
-      var isBinary = reIsBinary.test(value);
-      return (isBinary || reIsOctal.test(value))
-        ? freeParseInt(value.slice(2), isBinary ? 2 : 8)
-        : (reIsBadHex.test(value) ? NAN : +value);
+      return +value;
     }
 
     /**