Renamed CsvConfiguration property ReadEmptyStringAsNull to ReadEmptyFieldsAsDefault

[michelebastione]

The property was renamed to better clarify its purpose and usage. The original property has been left as a facade and obsoleted for eventual removal.

Summary by CodeRabbit

• New Features

  • Added a clearer configuration option for converting empty CSV fields to null or mapped-type defaults.
  • Retained the previous option as an obsolete compatibility alias.

• Bug Fixes

  • CSV parsing now consistently applies the configured empty-field handling behavior.

• Tests

  • Updated coverage to verify empty CSV fields are converted as configured.

[coderabbitai]

📝 Walkthrough

Walkthrough

The CSV configuration adds ReadEmptyFieldsAsDefault as the primary option. The obsolete ReadEmptyStringAsNull property forwards to it. CSV reader logic and tests now use the new option.

Changes

CSV empty-field handling

Layer / File(s)	Summary
Configuration contract src/MiniExcel.Csv/CsvConfiguration.cs	Adds ReadEmptyFieldsAsDefault and changes ReadEmptyStringAsNull to an obsolete compatibility alias.
Reader behavior and validation src/MiniExcel.Csv/CsvReader.cs, tests/MiniExcel.Csv.Tests/Issues/GithubIssuesTests.cs, tests/MiniExcel.Csv.Tests/Main/MiniExcelCsvAsyncTests.cs	Uses ReadEmptyFieldsAsDefault for empty-field conversion and updates related tests to configure the new property.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: 🔵 Low · up to 04912

CSV queries with headers can return empty strings instead of configured null/default values, making behavior inconsistent across query modes. This is a bounded correctness issue that should be addressed before relying on the renamed option broadly.

Suggested reviewers: aasaa444

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 4 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the main change: replacing ReadEmptyStringAsNull with ReadEmptyFieldsAsDefault. It does not mention that the original property remains as an obsolete alias, but that d…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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Inline comments:
In `@src/MiniExcel.Csv/CsvConfiguration.cs`:
- Line 16: Update the header-query path in CsvReader.QueryAsync to apply
ReadEmptyFieldsAsDefault when assigning header values, instead of returning
read[i] unchanged; preserve existing behavior when the option is disabled and
add coverage for a header query containing an empty field.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Essentials

Run ID: b8a6e759-c998-4667-b920-3baa48dbc51f

📥 Commits

Reviewing files that changed from the base of the PR and between fb70429 and 04912f9.

📒 Files selected for processing (4)

• src/MiniExcel.Csv/CsvConfiguration.cs
• src/MiniExcel.Csv/CsvReader.cs
• tests/MiniExcel.Csv.Tests/Issues/GithubIssuesTests.cs
• tests/MiniExcel.Csv.Tests/Main/MiniExcelCsvAsyncTests.cs

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