BigInt values cannot be serialized to JSON

[Radiiplus]

Description

The CCC library returns BigInt values from chain queries, but JavaScript's JSON.stringify() doesn't support BigInt, causing serialization failures.

Error

TypeError: Do not know how to serialize a BigInt
    at JSON.stringify (<anonymous>)

Reproduction

const launchData = await getLaunchFromChain(launchId);
// launchData.targetCkb is a BigInt
JSON.stringify(launchData); // Throws error

Expected Behavior

The library should either:

1. Provide built-in serialization helpers (e.g., launchData.toJSON())
2. Return string-encoded values by default
3. Document the required conversion pattern

Impact

Developers must manually convert every BigInt field before saving or transmitting data, which is error-prone and inconsistent.

Temporal Workaround

JSON.stringify({
  targetCkb: launchData.targetCkb.toString(),
  // ... every field
});

Request

Please provide a standard serialization/deserialization pattern for BigInt values in the library.

[Hanssen0]

Hi @Radiiplus! Thank you for mentioning this issue here to help others know the solution. A function called ccc.stringify has been provided to convert CCC entities to a JSON string, and this should solve this problem.