Remove 0xstring type, fix bigint <> number comparison

Author: jeffsmale90

packages/delegation-toolkit/src/caveatBuilder/erc721BalanceChangeBuilder.ts

@@ -48,7 +48,7 @@ export const erc721BalanceChangeBuilder = (
     throw new Error('Invalid recipient: must be a valid address');
   }
 
-  if (amount <= 0) {
+  if (amount <= 0n) {
     throw new Error('Invalid balance: must be a positive number');
   }
 

packages/delegation-toolkit/src/caveatBuilder/exactCalldataBuilder.ts

@@ -1,4 +1,5 @@
 import { createExactCalldataTerms } from '@metamask/delegation-core';
+import type { Hex } from 'viem';
 
 import type { Caveat, DeleGatorEnvironment } from '../types';
 
@@ -8,7 +9,7 @@ export type ExactCalldataBuilderConfig = {
   /**
    * The exact calldata that must be matched as a hex string.
    */
-  calldata: `0x${string}`;
+  calldata: Hex;
 };
 
 /**