diff --git a/src/common/TypedArrayUtils.test.ts b/src/common/TypedArrayUtils.test.ts
index 1df06f4c..69a62abc 100644
--- a/src/common/TypedArrayUtils.test.ts
+++ b/src/common/TypedArrayUtils.test.ts
@@ -9,26 +9,6 @@ type TypedArray = Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray
   | Int8Array | Int16Array | Int32Array
   | Float32Array | Float64Array;
 
-// we explicitly test against the looping version in the test cases
-function loopFill(array: TypedArray, value: number, start: number = 0, end?: number | undefined): TypedArray {
-  if (start >= array.length) {
-    return array;
-  }
-  start = (array.length + start) % array.length;
-  if (end === undefined) {
-    end = array.length;
-  }
-  if (end >= array.length) {
-    end = array.length;
-  } else {
-    end = (array.length + end) % array.length;
-  }
-  for (let i = start; i < end; ++i) {
-    array[i] = value;
-  }
-  return array;
-}
-
 describe('polyfill conformance tests', function(): void {
 
   function deepEquals(a: TypedArray, b: TypedArray): void {
@@ -79,78 +59,29 @@ describe('polyfill conformance tests', function(): void {
       deepEquals(fillFallback(u8Clamped1, 2), u8Clamped2.fill(2));
       deepEquals(fillFallback(u8Clamped1, 257), u8Clamped2.fill(257));
     });
-    it('should work with all typed array types - explicit looping', function(): void {
-      const u81 = new Uint8Array(5);
-      const u82 = new Uint8Array(5);
-      deepEquals(loopFill(u81, 2), u82.fill(2));
-      deepEquals(loopFill(u81, -1), u82.fill(-1));
-      const u161 = new Uint16Array(5);
-      const u162 = new Uint16Array(5);
-      deepEquals(loopFill(u161, 2), u162.fill(2));
-      deepEquals(loopFill(u161, 65535), u162.fill(65535));
-      deepEquals(loopFill(u161, -1), u162.fill(-1));
-      const u321 = new Uint32Array(5);
-      const u322 = new Uint32Array(5);
-      deepEquals(loopFill(u321, 2), u322.fill(2));
-      deepEquals(loopFill(u321, 65537), u322.fill(65537));
-      deepEquals(loopFill(u321, -1), u322.fill(-1));
-      const i81 = new Int8Array(5);
-      const i82 = new Int8Array(5);
-      deepEquals(loopFill(i81, 2), i82.fill(2));
-      deepEquals(loopFill(i81, -1), i82.fill(-1));
-      const i161 = new Int16Array(5);
-      const i162 = new Int16Array(5);
-      deepEquals(loopFill(i161, 2), i162.fill(2));
-      deepEquals(loopFill(i161, 65535), i162.fill(65535));
-      deepEquals(loopFill(i161, -1), i162.fill(-1));
-      const i321 = new Int32Array(5);
-      const i322 = new Int32Array(5);
-      deepEquals(loopFill(i321, 2), i322.fill(2));
-      deepEquals(loopFill(i321, 65537), i322.fill(65537));
-      deepEquals(loopFill(i321, -1), i322.fill(-1));
-      const f321 = new Float32Array(5);
-      const f322 = new Float32Array(5);
-      deepEquals(loopFill(f321, 1.2345), f322.fill(1.2345));
-      const f641 = new Float64Array(5);
-      const f642 = new Float64Array(5);
-      deepEquals(loopFill(f641, 1.2345), f642.fill(1.2345));
-      const u8Clamped1 = new Uint8ClampedArray(5);
-      const u8Clamped2 = new Uint8ClampedArray(5);
-      deepEquals(loopFill(u8Clamped1, 2), u8Clamped2.fill(2));
-      deepEquals(loopFill(u8Clamped1, 257), u8Clamped2.fill(257));
-    });
     it('start offset', function(): void {
       for (let i = -2; i < 10; ++i) {
         const u81 = new Uint8Array(5);
-        const u82 = new Uint8Array(5);
         const u83 = new Uint8Array(5);
         deepEquals(fillFallback(u81, 2, i), u83.fill(2, i));
         deepEquals(fillFallback(u81, -1, i), u83.fill(-1, i));
-        deepEquals(loopFill(u82, 2, i), u83.fill(2, i));
-        deepEquals(loopFill(u82, -1, i), u83.fill(-1, i));
       }
     });
     it('end offset', function(): void {
       for (let i = -2; i < 10; ++i) {
         const u81 = new Uint8Array(5);
-        const u82 = new Uint8Array(5);
         const u83 = new Uint8Array(5);
         deepEquals(fillFallback(u81, 2, 0, i), u83.fill(2, 0, i));
         deepEquals(fillFallback(u81, -1, 0, i), u83.fill(-1, 0, i));
-        deepEquals(loopFill(u82, 2, 0, i), u83.fill(2, 0, i));
-        deepEquals(loopFill(u82, -1, 0, i), u83.fill(-1, 0, i));
       }
     });
     it('start/end offset', function(): void {
       for (let i = -2; i < 10; ++i) {
         for (let j = -2; j < 10; ++j) {
           const u81 = new Uint8Array(5);
-          const u82 = new Uint8Array(5);
           const u83 = new Uint8Array(5);
           deepEquals(fillFallback(u81, 2, i, j), u83.fill(2, i, j));
           deepEquals(fillFallback(u81, -1, i, j), u83.fill(-1, i, j));
-          deepEquals(loopFill(u82, 2, i, j), u83.fill(2, i, j));
-          deepEquals(loopFill(u82, -1, i, j), u83.fill(-1, i, j));
         }
       }
     });