Support serialization configuration

**Problem**
When working with core, the error messages could be more descriptive.

**Suggestion**
Improve error handling and add detailed error messages.

**Context**
This would help with debugging and maintenance.

No file, test, or entry point is named. Start by locating the core serialization configuration and current error-handling paths, then clarify the intended configuration and error cases; done means the requested serialization behavior is configurable and the affected errors provide detailed debugging information.

Written by the indexing model from the issue text.