document empty-kvs short-circuit in LibFlow.flow NatSpec

[thedavidmeister]

Summary

LibFlow.flow skips the interpreterStore.set call entirely when kvs.length == 0 as a gas optimisation. The behaviour is intentional and is now stated in the NatSpec so custom stores cannot incorrectly assume set is invoked on every flow.

Test plan

• forge build — clean.
• full suite — 30/30.
• rainix-sol-static — exit 0.

Closes #307.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Updated documentation to explicitly clarify how the system handles scenarios with empty inputs.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 48d3a4d7-e1f5-4a8b-b0b4-55bf2a0d89b9

📥 Commits

Reviewing files that changed from the base of the PR and between 0ab5c74 and c7f444b.

📒 Files selected for processing (1)

• src/lib/LibFlow.sol

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Walkthrough

The PR updates inline documentation for LibFlow.flow to clarify that the interpreter-store set method is skipped when the kvs array is empty, explicitly documenting the gas optimization behavior without changing executable logic.

Changes

Documentation: kvs Short-Circuit Clarification

Layer / File(s)	Summary
Documentation src/lib/LibFlow.sol	Documentation for the flow function's kvs parameter now explicitly states that interpreterStore.set(...) is not invoked when kvs.length == 0, clarifying the gas optimization behavior.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related issues

• [A23-4] [LOW] LibFlow.flow: kvs.length>0 short-circuit silently suppresses store side effects #307: Addresses the proposed documentation fix for the kvs.length short-circuit behavior by documenting that the interpreter-store set is skipped when kvs is empty, fulfilling the optional documentation solution outlined in the issue.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly and clearly summarizes the main change: documenting the empty-kvs short-circuit behavior in LibFlow.flow NatSpec comments.
Linked Issues check	✅ Passed	The PR successfully addresses issue #307 by documenting that LibFlow.flow skips interpreterStore.set when kvs.length == 0, implementing one of the two proposed resolutions.
Out of Scope Changes check	✅ Passed	All changes are in-scope documentation updates to src/lib/LibFlow.sol NatSpec related to the kvs short-circuit behavior described in issue #307.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-05-04-issue-307-libflow-empty-kvs-natspec

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