Implement IEnumerable/IEnumerator in AbstractAppendingInt64Buffer, #279

[paulirwin]

• You've read the Contributor Guide and Code of Conduct.
• You've included unit or integration tests for your change, where applicable.
• You've included inline docs for your change, where applicable.
• There's an open issue for the PR that you are making. If you'd like to propose a change, please open an issue to discuss the change or find an existing issue.

Implement IEnumerable/IEnumerator in AbstractAppendingInt64Buffer

Fixes #279 (as the final remaining item)

Description

This implements IEnumerable properly in AbstractAppendingInt64Buffer, and updates the usages of the prior GetIterator method to use the enumerator.

[Copilot]

Pull request overview

Implements .NET enumeration support for AbstractAppendingInt64Buffer (so it can be used with foreach/LINQ) and updates internal call sites/tests that previously used the custom GetIterator() pattern.

Changes:

• Added IEnumerable<long> / IEnumerator<long> support to AbstractAppendingInt64Buffer via a new enumerator implementation.
• Updated DocValues writers to use the new enumerator instead of the removed iterator pattern.
• Updated tests and corrected private method naming typos (Enumberable → Enumerable) where touched.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
src/Lucene.Net/Util/Packed/AbstractAppendingLongBuffer.cs	Adds IEnumerable<long> support and replaces the custom iterator with an IEnumerator<long>-based enumerator.
src/Lucene.Net/Index/SortedSetDocValuesWriter.cs	Switches pending buffer iteration to use GetEnumerator() in iterator blocks.
src/Lucene.Net/Index/SortedDocValuesWriter.cs	Renames private enumerable helpers and switches ord iteration to GetEnumerator().
src/Lucene.Net/Index/NumericDocValuesWriter.cs	Switches numeric pending buffer iteration to GetEnumerator() in an iterator block.
src/Lucene.Net/Index/BinaryDocValuesWriter.cs	Switches lengths buffer iteration to GetEnumerator() in an iterator block.
src/Lucene.Net.Tests/Util/Packed/TestPackedInts.cs	Updates tests to validate enumeration via MoveNext()/Current.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.