Support 64-bit integers in daemon XML-RPC

[sylvesterkaczmarek]

Summary

Fixes #629.

Python's standard XML-RPC marshaller rejects integers outside the signed 32-bit range even though its unmarshaller supports the standard i8 extension.

Register a custom integer marshaller that:

• preserves the normal int tag for signed 32-bit values
• uses i8 for signed 64-bit values
• continues rejecting values outside signed 64-bit range

This allows daemon RPC payloads to carry 64-bit integer values without changing existing 32-bit output.

Testing

Added focused round-trip coverage for:

• signed 32-bit values using int
• positive and negative values outside 32-bit using i8
• signed 64-bit boundaries
• rejection outside the signed 64-bit range

Did you use Generative AI?

Yes. AI was used to assist with tests.

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