Add test for pointer = 0

test/ordinals.test.js

@@ -1,4 +1,4 @@
-import { deepStrictEqual } from 'node:assert';
+import { deepStrictEqual, strictEqual } from 'node:assert';
 import { describe, should } from 'micro-should';
 import { hex, utf8 } from '@scure/base';
 import * as btc from '@scure/btc-signer';
@@ -67,6 +67,17 @@ describe('Ordinals', () => {
     });
   });
 
+  should('support explicit pointer 0', () => {
+    const { TagCoder } = ordinals.__test__;
+    const encoded = TagCoder.decode({ pointer: 0n });
+
+    const encodedTag = encoded[0].tag[0]
+    const encodedValue = encoded[0].data[0]
+
+    strictEqual(encodedTag, 2);
+    strictEqual(encodedValue, 0);
+  })
+
   should('inscription/11820782', () => {
     // https://ordiscan.com/inscription/11820782
     const rawTx = ordvectors[0].raw_tx;