Fix ChainProperties JSON decoding

packages/types/src/generic/ChainProperties.spec.ts

@@ -12,15 +12,11 @@ describe('ChainProperties', (): void => {
     ).toEqual(['ss58Format', 'tokenDecimals', 'tokenSymbol']);
   });
 
-  it('decodes from an actual object', (): void => {
-    const { ss58Format, tokenDecimals, tokenSymbol } = registry.createType('ChainProperties', {
-      ss58Format: 2,
-      tokenDecimals: 15,
-      tokenSymbol: 'KSM'
-    });
+  it('decodes from an actual JSON', (): void => {
+    const { ss58Format, tokenDecimals, tokenSymbol } = registry.createType('ChainProperties', JSON.parse('{"ss58Format":2,"tokenDecimals":12,"tokenSymbol":"KSM"}'));
 
     expect(ss58Format.unwrap().eq(2)).toBe(true);
-    expect(tokenDecimals.unwrap().eq([15])).toBe(true);
+    expect(tokenDecimals.unwrap().eq([12])).toBe(true);
     expect(tokenSymbol.unwrap().eq(['KSM'])).toBe(true);
   });
 

packages/types/src/generic/ChainProperties.ts

@@ -11,10 +11,10 @@ import { Vec } from '../codec/Vec';
 import { Text } from '../primitive/Text';
 import { u32 } from '../primitive/U32';
 
-function createValue (registry: Registry, type: string, value: unknown, asArray = true): Codec {
+function createValue (registry: Registry, type: string, value: unknown, asArray = true): Option<Codec> {
   // We detect codec here as well - when found, generally this is constructed from itself
-  if (isFunction((value as Codec).toHuman) && (isFunction((value as Option<Codec>).unwrapOrDefault) || (!asArray || Array.isArray(value)))) {
-    return value as Codec;
+  if (isFunction((value as Option<Codec>).unwrapOrDefault)) {
+    return value as Option<Codec>;
   }
 
   return registry.createType(