Use parseBigInt in Contract's argument parsing

src/contract.ts

@@ -1,4 +1,5 @@
 import { ContractAction } from "./types.js";
+import { parseBigInt } from "./utils.js";
 
 export function extractActionsFromContract(code: string): ContractAction[] {
   const regex = /actions\s+triggered_by:\s+transaction,\s+on:\s+([\w\s.,()]+?)\s+do/g;
@@ -27,7 +28,7 @@ export function parseTypedArgument(input: any): any {
     return input; // Return input as is
   } else if (!isNaN(input)) {
     // Check if input is a number
-    return parseFloat(input); // Parse input as a float
+    return parseBigInt(input); // Parse input as a bigint
   } else {
     return input; // Return input as string
   }