diff --git a/CHANGELOG.md b/CHANGELOG.md
index 712ef5e87..10de0f2c2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,14 +2,14 @@
 
 ## 4.0.0-x
 
-- **Breaking change** Polyfills are not provided by these libraries anymore to avoid clobbering external globals, the user should provide them if their environment is missing base functionality.
+- **Breaking change** Polyfills are not injected by these libraries anymore to avoid clobbering external globals, the user should provide them if their environment is missing base functionality.
 
 Changes:
 
 - Remove built-in utility polyfills for `Array.fill`, `String.padStart`, `String.padEnd` as well as `Object.setPrototypeOf`. These should be provided by the actual user of the libraries if so required.
 - Update `@polkadot/wasm-crypto` library (under-the-hood cleanups)
 - Remove explicit crypto polyfill injection (aligning with updated `@polkadot/wasm-crypto`)
-- Add `@polkadot/x-randomvalues` polyfill (for use in `@polkadot/wasm-crypto`)
+- Add cross-environment `@polkadot/x-randomvalues` (for use in `@polkadot/wasm-crypto`)
 
 
 ## 3.7.1 Nov 1, 2020
diff --git a/packages/util-crypto/package.json b/packages/util-crypto/package.json
index ad42bdf76..330396a61 100644
--- a/packages/util-crypto/package.json
+++ b/packages/util-crypto/package.json
@@ -28,7 +28,7 @@
     "@babel/runtime": "^7.12.1",
     "@polkadot/networks": "^4.0.0-9",
     "@polkadot/util": "^4.0.0-9",
-    "@polkadot/wasm-crypto": "^2.0.0-10",
+    "@polkadot/wasm-crypto": "^2.0.1",
     "@polkadot/x-randomvalues": "^4.0.0-9",
     "base-x": "^3.0.8",
     "blakejs": "^1.1.0",
diff --git a/packages/util-crypto/src/base32/is.ts b/packages/util-crypto/src/base32/is.ts
index 56f058428..93cdf849e 100644
--- a/packages/util-crypto/src/base32/is.ts
+++ b/packages/util-crypto/src/base32/is.ts
@@ -3,10 +3,14 @@
 
 import validate from './validate';
 
-export default function isBase32 (value?: string | null): boolean {
+export function testValidator (validate: (value?: string | null, ipfsCompat?: boolean) => boolean, value?: string | null, ipfsCompat?: boolean): boolean {
   try {
-    return validate(value);
+    return validate(value, ipfsCompat);
   } catch (error) {
     return false;
   }
 }
+
+export default function isBase32 (value?: string | null, ipfsCompat?: boolean): boolean {
+  return testValidator(validate, value, ipfsCompat);
+}
diff --git a/packages/util-crypto/src/base58/is.ts b/packages/util-crypto/src/base58/is.ts
index a004491b5..02ed1beb1 100644
--- a/packages/util-crypto/src/base58/is.ts
+++ b/packages/util-crypto/src/base58/is.ts
@@ -1,12 +1,9 @@
 // Copyright 2017-2020 @polkadot/util-crypto authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
+import { testValidator } from '../base32/is';
 import validate from './validate';
 
 export default function isBase58 (value?: string | null, ipfsCompat?: boolean): boolean {
-  try {
-    return validate(value, ipfsCompat);
-  } catch (error) {
-    return false;
-  }
+  return testValidator(validate, value, ipfsCompat);
 }
diff --git a/packages/util/src/bn/toBn.ts b/packages/util/src/bn/toBn.ts
index d3c015271..7dd37c395 100644
--- a/packages/util/src/bn/toBn.ts
+++ b/packages/util/src/bn/toBn.ts
@@ -10,6 +10,14 @@ import isToBn from '../is/toBn';
 import isHex from '../is/hex';
 import hexToBn from '../hex/toBn';
 
+function numberToBn <ExtToBn extends ToBn> (value: number | ExtToBn | BN): BN {
+  return BN.isBN(value)
+    ? value
+    : isToBn(value)
+      ? value.toBn()
+      : new BN(value);
+}
+
 /**
  * @name bnToBn
  * @summary Creates a BN value from a BN, BigInt, string (base 10 or hex) or number input.
@@ -35,9 +43,5 @@ export default function bnToBn <ExtToBn extends ToBn> (value?: ExtToBn | BN | Bi
     return new BN(value.toString());
   }
 
-  return BN.isBN(value)
-    ? value
-    : isToBn(value)
-      ? value.toBn()
-      : new BN(value);
+  return numberToBn(value);
 }
diff --git a/packages/util/src/bn/toU8a.ts b/packages/util/src/bn/toU8a.ts
index 597c1db9d..7e915e1cb 100644
--- a/packages/util/src/bn/toU8a.ts
+++ b/packages/util/src/bn/toU8a.ts
@@ -12,7 +12,13 @@ interface Options extends ToBnOptions {
   bitLength?: number;
 }
 
-function setBn (valueBn: BN, byteLength: number, { isLe, isNegative }: Options): Uint8Array {
+function createEmpty (byteLength: number, options: Options): Uint8Array {
+  return options.bitLength === -1
+    ? new Uint8Array()
+    : new Uint8Array(byteLength);
+}
+
+function createValue (valueBn: BN, byteLength: number, { isLe, isNegative }: Options): Uint8Array {
   const output = new Uint8Array(byteLength);
   const bn = isNegative ? valueBn.toTwos(byteLength * 8) : valueBn;
 
@@ -51,10 +57,8 @@ function bnToU8a <ExtToBn extends ToBn> (value?: ExtToBn | BN | BigInt | number
     : Math.ceil((options.bitLength || 0) / 8);
 
   return value
-    ? setBn(valueBn, byteLength, options)
-    : options.bitLength === -1
-      ? new Uint8Array()
-      : new Uint8Array(byteLength);
+    ? createValue(valueBn, byteLength, options)
+    : createEmpty(byteLength, options);
 }
 
 export default bnToU8a;
diff --git a/packages/util/src/format/formatElapsed.ts b/packages/util/src/format/formatElapsed.ts
index a579e5ca2..f6b30e7a1 100644
--- a/packages/util/src/format/formatElapsed.ts
+++ b/packages/util/src/format/formatElapsed.ts
@@ -35,11 +35,7 @@ export default function formatElapsed <ExtToBn extends ToBn> (now?: Date | null,
   const tsNow = (now && now.getTime()) || 0;
   const tsValue = getValue(value || 0);
 
-  if (tsNow && tsValue) {
-    const elapsed = Math.max(Math.abs(tsNow - tsValue), 0) / 1000;
-
-    return formatValue(elapsed);
-  }
-
-  return '0.0s';
+  return (tsNow && tsValue)
+    ? formatValue(Math.max(Math.abs(tsNow - tsValue), 0) / 1000)
+    : '0.0s';
 }
diff --git a/packages/util/src/logger.ts b/packages/util/src/logger.ts
index aebd910ec..7dedf39b8 100644
--- a/packages/util/src/logger.ts
+++ b/packages/util/src/logger.ts
@@ -22,14 +22,16 @@ const logTo = {
   warn: 'warn'
 };
 
-function formatObject (value: Record<string, unknown>): Record<string, unknown> {
-  const result: Record<string, unknown> = {};
+function formatOther (value: unknown): unknown {
+  if (value && isObject(value) && value.constructor === Object) {
+    return Object.keys(value).reduce((result: Record<string, unknown>, key): Record<string, unknown> => {
+      result[key] = format(value[key]);
 
-  return Object.keys(value).reduce((result, key): Record<string, unknown> => {
-    result[key] = format(value[key]);
+      return result;
+    }, {});
+  }
 
-    return result;
-  }, result);
+  return value;
 }
 
 export function format (value: unknown): unknown {
@@ -39,11 +41,9 @@ export function format (value: unknown): unknown {
     return value.toString();
   } else if (isU8a(value) || isBuffer(value)) {
     return u8aToHex(u8aToU8a(value));
-  } else if (value && isObject(value) && value.constructor === Object) {
-    return formatObject(value);
   }
 
-  return value;
+  return formatOther(value);
 }
 
 function apply (log: LogType, type: string, values: Logger$Data): void {
diff --git a/packages/util/src/u8a/toU8a.ts b/packages/util/src/u8a/toU8a.ts
index eb6c3186d..3cfeeb431 100644
--- a/packages/util/src/u8a/toU8a.ts
+++ b/packages/util/src/u8a/toU8a.ts
@@ -8,6 +8,18 @@ import bufferToU8a from '../buffer/toU8a';
 import hexToU8a from '../hex/toU8a';
 import stringToU8a from '../string/toU8a';
 
+function convertArray (value: number[] | Uint8Array): Uint8Array {
+  return Array.isArray(value)
+    ? Uint8Array.from(value)
+    : value;
+}
+
+function convertString (value: string): Uint8Array {
+  return isHex(value)
+    ? hexToU8a(value)
+    : stringToU8a(value);
+}
+
 /**
  * @name u8aToU8a
  * @summary Creates a Uint8Array value from a Uint8Array, Buffer, string or hex input.
@@ -29,12 +41,8 @@ export default function u8aToU8a (value?: number[] | Buffer | Uint8Array | strin
   } else if (isBuffer(value)) {
     return bufferToU8a(value);
   } else if (isString(value)) {
-    return isHex(value)
-      ? hexToU8a(value)
-      : stringToU8a(value);
+    return convertString(value);
   }
 
-  return Array.isArray(value)
-    ? Uint8Array.from(value)
-    : value;
+  return convertArray(value);
 }
diff --git a/packages/x-randomvalues/src/fallback.spec.ts b/packages/x-randomvalues/src/fallback.spec.ts
new file mode 100644
index 000000000..9ac31caff
--- /dev/null
+++ b/packages/x-randomvalues/src/fallback.spec.ts
@@ -0,0 +1,20 @@
+// Copyright 2017-2020 @polkadot/x-randomvalues authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import fallback from './fallback';
+
+describe('fallback (insecure)', (): void => {
+  it('subsequent results does not match', (): void => {
+    expect(
+      fallback(new Uint8Array(32)).toString()
+    ).not.toEqual(
+      fallback(new Uint8Array(32)).toString()
+    );
+  });
+
+  it('generates with the supplied length', (): void => {
+    expect(
+      fallback(new Uint8Array(128))
+    ).toHaveLength(128);
+  });
+});
diff --git a/packages/x-randomvalues/src/fallback.ts b/packages/x-randomvalues/src/fallback.ts
index ffed5c922..c9fe54d9b 100644
--- a/packages/x-randomvalues/src/fallback.ts
+++ b/packages/x-randomvalues/src/fallback.ts
@@ -16,11 +16,11 @@ export default function insecureRandomValues <T extends Uint8Array> (arr: T): T
   let r = 0;
 
   for (let i = 0; i < arr.length; i++) {
-    if ((i & 0x03) === 0) {
+    if ((i & 0b11) === 0) {
       r = Math.random() * 0x100000000;
     }
 
-    arr[i] = (r >>> ((i & 0x03) << 3)) & 0xff;
+    arr[i] = (r >>> ((i & 0b11) << 3)) & 0xff;
   }
 
   return arr;
diff --git a/packages/x-randomvalues/src/react-native.ts b/packages/x-randomvalues/src/react-native.ts
index f9321e864..796ddb642 100644
--- a/packages/x-randomvalues/src/react-native.ts
+++ b/packages/x-randomvalues/src/react-native.ts
@@ -16,9 +16,6 @@ interface RNExt {
 }
 
 function getRandomValuesNative <T extends Uint8Array> (arr: T): T {
-  // We may want to use a base64 decoder here, but we certainly have an issue where we
-  // want/need this part as lean as possible. Since Buffer is already needed elsewhere
-  // (an generally prevalent in JS), we rather use it as-is.
   return Buffer
     .from((NativeModules as RNExt).RNGetRandomValues.getRandomBase64(arr.length), 'base64')
     .reduce((arr, byte, index): T => {
diff --git a/packages/x-textdecoder/src/browser.ts b/packages/x-textdecoder/src/browser.ts
index a914b06d2..ac01b6850 100644
--- a/packages/x-textdecoder/src/browser.ts
+++ b/packages/x-textdecoder/src/browser.ts
@@ -4,5 +4,5 @@
 import Fallback from './fallback';
 
 export default typeof TextDecoder === 'undefined'
-  ? Fallback
+  ? Fallback as unknown as typeof TextDecoder
   : TextDecoder;
diff --git a/packages/x-textdecoder/src/fallback.ts b/packages/x-textdecoder/src/fallback.ts
index dad31b2c2..7b9d4441c 100644
--- a/packages/x-textdecoder/src/fallback.ts
+++ b/packages/x-textdecoder/src/fallback.ts
@@ -1,6 +1,7 @@
 // Copyright 2017-2020 @polkadot/x-textencoder authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
+// This is very limited, only handling Ascii values
 export default class TextDecoder {
   // eslint-disable-next-line @typescript-eslint/no-unused-vars,no-useless-constructor
   constructor (_: 'utf-8') {
diff --git a/packages/x-textencoder/src/browser.ts b/packages/x-textencoder/src/browser.ts
index f4f7246b0..39a2ba5e2 100644
--- a/packages/x-textencoder/src/browser.ts
+++ b/packages/x-textencoder/src/browser.ts
@@ -1,16 +1,8 @@
 // Copyright 2017-2020 @polkadot/x-textencoder authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
+import Fallback from './fallback';
+
 export default typeof TextEncoder === 'undefined'
-  ? class {
-    encode (value: string): Uint8Array {
-      const u8a = new Uint8Array(value.length);
-
-      for (let i = 0; i < value.length; i++) {
-        u8a[i] = value.charCodeAt(i);
-      }
-
-      return u8a;
-    }
-  }
+  ? Fallback as unknown as typeof TextEncoder
   : TextEncoder;
diff --git a/packages/x-textencoder/src/fallback.ts b/packages/x-textencoder/src/fallback.ts
new file mode 100644
index 000000000..d14a7e1d9
--- /dev/null
+++ b/packages/x-textencoder/src/fallback.ts
@@ -0,0 +1,15 @@
+// Copyright 2017-2020 @polkadot/x-textencoder authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+// This is very limited, only handling Ascii values
+export default class TextEncoder {
+  encode (value: string): Uint8Array {
+    const u8a = new Uint8Array(value.length);
+
+    for (let i = 0; i < value.length; i++) {
+      u8a[i] = value.charCodeAt(i);
+    }
+
+    return u8a;
+  }
+}
diff --git a/packages/x-textencoder/src/node.ts b/packages/x-textencoder/src/node.ts
index 21e85555f..2d8862693 100644
--- a/packages/x-textencoder/src/node.ts
+++ b/packages/x-textencoder/src/node.ts
@@ -3,19 +3,21 @@
 
 import { TextEncoder as NodeTextEncoder } from 'util';
 
+class NodeFallback {
+  #encoder: NodeTextEncoder;
+
+  constructor () {
+    this.#encoder = new NodeTextEncoder();
+  }
+
+  // For a Jest 26.0.1 environment, Buffer !== Uint8Array
+  encode (value: string): Uint8Array {
+    const encoded = this.#encoder.encode(value);
+
+    return Uint8Array.from(encoded);
+  }
+}
+
 export default typeof TextEncoder === 'undefined'
-  ? class {
-    #encoder: NodeTextEncoder;
-
-    constructor () {
-      this.#encoder = new NodeTextEncoder();
-    }
-
-    // For a Jest 26.0.1 environment, Buffer !== Uint8Array
-    encode (value: string): Uint8Array {
-      const encoded = this.#encoder.encode(value);
-
-      return Uint8Array.from(encoded);
-    }
-  } as unknown as typeof TextEncoder
+  ? NodeFallback as unknown as typeof TextEncoder
   : TextEncoder;
diff --git a/yarn.lock b/yarn.lock
index 9c07f126f..1141599c8 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1861,7 +1861,7 @@ __metadata:
     "@babel/runtime": ^7.12.1
     "@polkadot/networks": ^4.0.0-9
     "@polkadot/util": ^4.0.0-9
-    "@polkadot/wasm-crypto": ^2.0.0-10
+    "@polkadot/wasm-crypto": ^2.0.1
     "@polkadot/x-randomvalues": ^4.0.0-9
     "@types/bn.js": ^4.11.6
     "@types/create-hash": ^1.2.2
@@ -1896,13 +1896,13 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@polkadot/wasm-crypto@npm:^2.0.0-10":
-  version: 2.0.0-10
-  resolution: "@polkadot/wasm-crypto@npm:2.0.0-10"
+"@polkadot/wasm-crypto@npm:^2.0.1":
+  version: 2.0.1
+  resolution: "@polkadot/wasm-crypto@npm:2.0.1"
   peerDependencies:
     "@polkadot/util": "*"
     "@polkadot/x-randomvalues": "*"
-  checksum: 1217c72172b3781608280bd6c001b199ada00cec14326b27d081e1904967fc0246f512d1cd74bd15797c87f39d2efec2d639d89c608c0bcf140ec05ff8fe7564
+  checksum: eb5ff8e6614c98dcac94967e40d4e96bdd48521f26ab1f6419dbf14a9d76080880ab069ea2a1a55b1bd86b5c9f1480810bfb2ae36f3d54312a1631c0fefb04e3
   languageName: node
   linkType: hard