Improve JSON unmarshal error handling and add tests

[moutonjeremy]

Enhance error handling for JSON unmarshalling in the parseInput function to provide clearer validation error messages. Add tests to verify the handling of JSON type mismatch errors.

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Note

Convert JSON type mismatches in parseInput into readable validation errors and add tests for mismatches, wrapped errors, and custom handlers.

• Core:
  • parseInput in common.go: detect json.UnmarshalTypeError via errors.As and return readable validation message (invalid type for field ...).
• Tests:
  • Add json_type_error_test.go with cases for type mismatches, wrapped errors, and a custom validation error handler.

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[Copilot]

Pull request overview

This PR enhances JSON unmarshalling error handling by transforming cryptic type mismatch errors into clear, user-friendly validation messages. It adds comprehensive test coverage to ensure JSON type errors are properly caught and formatted.

• Improved error messages for JSON type mismatches in the parseInput function
• Added comprehensive test cases for various JSON type mismatch scenarios
• Verified custom validation error handler integration with JSON type errors

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
common.go	Added JSON unmarshalling error detection and transformation logic to provide clearer error messages when field types don't match expected types
json_type_error_test.go	Added comprehensive test suite covering JSON type mismatch scenarios including string/number/object mismatches and custom validation error handler integration

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

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