Adjust encoder/decoder fallbacks (#750)

* Adjust encoder/decoder fallbacks

* Dep-dup is functions

* Complexity cleanups

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);
+}

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);
 }