Allow blake2 & parity-codec in trie (#251)

* Start codec implementation

* Expose all constants

* NodeHeader encoding/decoding

* Encoding in NodeHeader

* Constants for Node types

* Moce codec to trie-codec

* Encode/decode in place (untested)

* WIP, tests starting to be put in place

* One passing test :)

* Another test bites the dust...

* One more test down...

* One more down

* Additional tests

* Formatting

* Long keys passing

* Trie tests

* Follow the script, no all-in-all encoder

* First simple trie test passing

* Another one down

* Extra checks remove (debug)

* 80% there with tests...

* One more, one left

* Trie tests passing

* ISC -> Apache-2.0

* Add compact util functions

* Tests to TypeScript

* Remove @polkadot/types deps, ethereum stub

* Bump

* Genesis tests with chainspecs

* Cleanup tests (ease of debugging)

* Substrate test passes, branch fails (again)

* Checks passing, tests passing

* Re-add Ethereum & snapshot tests (not passing atm)

* Re-add index test (also not 100%)

* Mid-way in generic trie-root

* Cleanup ethereumjs-testing definitions

* Update deps

* Less intrusive renames in trie-hash

* Self-review cleanups #1

* asNibbles -> toNibbles

* Cleanups

* Expand tests

* Cleanup imports

* Fix logger test (fly-by refactor)

* Update snapshot test

packages/util-rlp/src/decoder/index.ts

@@ -21,7 +21,7 @@ import internalDecode from './decode';
  * decode(new Uint8Array([0x83, 0x64, 0x6f, 0x67])); // => 'dog' as Uint8Array
  * ```
  */
-export default function decoder (input?: Uint8Array): Uint8Array | Array<any> {
+export default function decoder (input?: null | Uint8Array): Uint8Array | Array<any> {
   try {
     if (!input || input.length === 0) {
       return new Uint8Array([]);