drop unneeded non-standard %TypedArray%.prototype.toSpliced feature…

… detection

packages/core-js/modules/esnext.typed-array.to-spliced.js

@@ -6,29 +6,13 @@ var isBigIntArray = require('../internals/is-big-int-array');
 var toAbsoluteIndex = require('../internals/to-absolute-index');
 var toBigInt = require('../internals/to-big-int');
 var toIntegerOrInfinity = require('../internals/to-integer-or-infinity');
-var fails = require('../internals/fails');
 
 var aTypedArray = ArrayBufferViewCore.aTypedArray;
 var getTypedArrayConstructor = ArrayBufferViewCore.getTypedArrayConstructor;
 var exportTypedArrayMethod = ArrayBufferViewCore.exportTypedArrayMethod;
 var max = Math.max;
 var min = Math.min;
 
-// some early implementations, like WebKit, does not follow the final semantic
-var PROPER_ORDER = !fails(function () {
-  // eslint-disable-next-line es/no-typed-arrays -- required for testing
-  var array = new Int8Array([1]);
-
-  var spliced = array.toSpliced(1, 0, {
-    valueOf: function () {
-      array[0] = 2;
-      return 3;
-    }
-  });
-
-  return spliced[0] !== 2 || spliced[1] !== 3;
-});
-
 // `%TypedArray%.prototype.toSpliced` method
 // https://tc39.es/proposal-change-array-by-copy/#sec-%typedarray%.prototype.toSpliced
 exportTypedArrayMethod('toSpliced', function toSpliced(start, deleteCount /* , ...items */) {
@@ -65,4 +49,4 @@ exportTypedArrayMethod('toSpliced', function toSpliced(start, deleteCount /* , .
   for (; k < newLen; k++) A[k] = O[k + actualDeleteCount - insertCount];
 
   return A;
-}, !PROPER_ORDER);
+}, true);