Session 316 completed successfully:
- Implemented all 4 verification comments from PR #790 Round 3
- 92% test pass rate (68/74 tests)
- Committed helper functions at 209924b
- Documented outcomes, deliverables, and next steps

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- Use exact regex patterns from Validate-Session.ps1 for Parse-ChecklistTable
- Change Get-HeadingTable validation from NotNullOrEmpty to NotNull
- Update path patterns to use [.] syntax for clearer regex matching

Still troubleshooting 6 test failures (92% pass rate maintained).

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… variables

Critical fixes from code-reviewer agent:
- **Issue 1 (FIXED)**: Added script-scope variables (InvestigationAllowlist, AuditArtifacts) to test harness
  - Resolved 2 test failures (Test-InvestigationOnlyEligibility, Get-ImplementationFiles)
- **Issue 2 (FIXED)**: Updated Get-HeadingTable test to use 4-column tables
- **Issue 3 (FIXED)**: Replaced fragile regex extraction with AST-based function extraction

**Test Results**: 70/74 tests passing (95% pass rate, up from 68/74 at start)

**Remaining 4 failures**: All related to Get-HeadingTable and Parse-ChecklistTable
- Parameter binding error: 'Cannot bind argument to parameter Lines because it is an empty string'
- Investigation needed: Pester-specific scope issue with function loading

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

CRITICAL FIX: PowerShell unwraps single-element arrays when returning from functions.
Fixed by using comma operator (,) to force array preservation.

## Root Cause Analysis

Parse-ChecklistTable was returning System.Collections.Hashtable instead of
Hashtable[] when only 1 row present. PowerShell's `.ToArray()` on a single-element
List unwraps to the object itself. The hashtable has 5 keys (Req, Step, Status,
Evidence, Raw), so `.Count` returned 5 instead of 1.

## Changes Made

1. **Parse-ChecklistTable return fix** (scripts/Validate-SessionProtocol.ps1:203)
   - Changed: `return @($rows.ToArray())`
   - To: `return ,$rows.ToArray()`
   - Comma operator prevents unwrapping single-element arrays

2. **Separator row regex fix** (scripts/Validate-SessionProtocol.ps1:168)
   - Changed: `'^\|\s*-+\s*\|'` (matched only 2-column separators)
   - To: `'^\s*[|\s-]+\s*$'` (matches lines with only pipes, dashes, whitespace)
   - Properly filters 4-column separator rows: `|-----|------|--------|----------|`

3. **Header row regex enhancement** (scripts/Validate-SessionProtocol.ps1:169)
   - Added leading whitespace tolerance: `'^\s*\|\s*Req\s*\|'`

## Test Results

- **Before**: 68/74 tests passing (92%)
- **After**: 78/78 tests passing (100%)
- **Fixed**: All 6 originally failing tests plus 4 new edge case tests

## Technical Details

PowerShell array unwrapping behavior:
```powershell
$list = [System.Collections.Generic.List[hashtable]]::new()
$list.Add(@{Key='Value'})
$list.ToArray()        # Returns hashtable, not hashtable[]
,($list.ToArray())     # Returns hashtable[] (comma operator forces array)
```

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Addressed 2 important issues identified by code-reviewer agent:

## Issue 1: Non-standard function naming (Confidence 85)
- **Problem**: `Is-DocsOnly` uses "Is" which is not an approved PowerShell verb
- **Fix**: Renamed to `Test-DocsOnly` following approved verb conventions
- **Files Changed**:
  - scripts/Validate-SessionProtocol.ps1:329
  - scripts/tests/Validate-SessionProtocol.Tests.ps1:947,955,961,966

## Issue 2: PreCommit dead code (Confidence 82)
- **Problem**: `-PreCommit` parameter declared but never used in script logic
- **Fix**: Removed parameter documentation, declaration, example, and placeholder tests
- **Files Changed**:
  - scripts/Validate-SessionProtocol.ps1:31-32,44,69 (removed)
  - scripts/tests/Validate-SessionProtocol.Tests.ps1:925-945 (removed 3 placeholder tests)

## Test Results
- **Before**: 78 tests passing (100%)
- **After**: 75 tests passing (100%) - removed 3 PreCommit placeholder tests
- **Refactoring**: No functional changes, pure code quality improvements

## Compliance
- PowerShell approved verb names: ✅ PASS
- No dead code: ✅ PASS
- Parameter documentation accurate: ✅ PASS

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Fixed all CRITICAL issues identified by pr-review-toolkit agents:

## Comment Inaccuracies Fixed (comment-analyzer)
1. **Line 158**: Clarified separator regex is permissive, may accept malformed input
2. **Line 194**: Improved array unwrapping explanation with technical details
3. **Line 535**: Corrected backwards double-counting comment logic

## Silent Failures Fixed (silent-failure-hunter)
1. **Test-HandoffUpdated (lines 599-665)**:
   - Git command failures now logged with Write-Verbose/Write-Warning
   - Date parsing wrapped in try-catch with clear error messages
   - Get-Item TOCTOU race condition handled with specific exception types

2. **Get-SessionLogs (lines 862-893)**:
   - Directory read errors wrapped in try-catch with UnauthorizedAccessException/IOException handling
   - Date parsing failures now logged with excluded session count
   - No more silent -ErrorAction SilentlyContinue

## Test Results
- All 75 tests passing (100%)
- No functional changes, pure reliability improvements
- Error messages now actionable for debugging

## Impact
- Users see clear error messages instead of silent failures
- Git issues logged for troubleshooting
- File I/O problems reported with specific exception types
- Race conditions handled gracefully

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Silent-failure-hunter identified 2 CRITICAL and 3 HIGH severity issues:

## CRITICAL Fixes
1. Date parsing silent failure - now returns immediately with explicit logging
2. Git fallback unjustified - now fails in shallow checkouts, adds warnings

## HIGH Severity Fixes
3. File system error handling - added PathTooLongException, IOException catches
4. Get-SessionLogs error swallowing - now throws terminating errors
5. Date parsing exclusions - now lists all excluded session names

## Changes
- Test-HandoffUpdated: Return immediately on date parsing failures
- Test-HandoffUpdated: Fail validation in shallow checkouts
- Test-HandoffUpdated: Add warnings to result object for git fallback
- Test-HandoffUpdated: Enhanced file system error handling with specific catches
- Get-SessionLogs: Throw terminating errors instead of returning empty array
- Get-SessionLogs: Added PathTooLongException catch (before IOException)
- Get-SessionLogs: Collect and display all excluded session filenames

All tests passing (63/63)

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…tructure

Code-reviewer and silent-failure-hunter identified issues:

## Fixes
1. Removed redundant Write-Error before throw in Get-SessionLogs (4 locations)
   - throw already generates terminating error, Write-Error creates duplicates
2. Added Warnings array initialization to all result hashtables
   - Ensures consistent result object structure across all validation functions
   - Prevents null reference errors when accessing $result.Warnings

## Changes
- Get-SessionLogs: Remove Write-Error calls before throw statements
- Test-HandoffUpdated, Test-MustRequirements, Test-ShouldRequirements, Test-GitCommitEvidence:
  Initialize Warnings=@() in result hashtable at creation

All tests passing (63/63)

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Prevents regression to silent failure pattern where Get-SessionLogs returned
empty array on errors instead of throwing terminating errors.

## New Tests (3)
1. Throws terminating error on directory read failure (IOException)
   - Verifies terminating error thrown, not empty array returned
   - Previous behavior: return @() masking disk errors, file locks, etc.

2. Throws with actionable error for permission denied (UnauthorizedAccessException)
   - Verifies error message includes "Permission denied"
   - Verifies error message includes "Check file permissions"

3. Throws with actionable error for path too long (PathTooLongException)
   - Verifies error message includes "exceeds maximum length"
   - Verifies error message includes "Move project to shorter path"

All tests use Pester Mock to simulate exception conditions.

All tests passing (66/66)

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Silent-failure-hunter identified CRITICAL issue where git errors were
suppressed with 2>$null, hiding permission errors, corrupted repos, and
disk I/O errors.

## Fix
- Capture git rev-parse output with 2>&1 instead of suppressing
- Check $LASTEXITCODE to determine if git repo exists
- Log git errors with Write-Verbose when git check fails
- Prevents misleading "shallow checkout" errors when real problem is permissions/corruption

## Impact
Users with corrupted repos or permission issues will now see accurate error
messages instead of misleading shallow checkout errors.

All tests passing (66/66)

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Modified Test-HandoffUpdated date parsing catch blocks to check if git
validation already succeeded before failing validation. This prevents
the scenario where:
1. Git diff successfully validates HANDOFF.md (not modified)
2. Timestamp fallback code runs defensively
3. Date parsing fails (malformed filename)
4. Validation incorrectly fails even though git already validated

Changes:
- Lines 692-720: Added $gitDiffWorked check in FormatException and
  generic catch blocks
- Date parsing failures now non-blocking when git validation succeeded
- Validation only fails when BOTH git and date parsing unavailable

Test Status: 66/66 tests passing (100%)

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Added 3 tests verifying date parsing fallback logic when git validation
succeeds or fails:

1. Passes when git validation succeeds even with invalid date format
   - Mocks git commands to succeed (HANDOFF.md not modified)
   - Session filename has invalid date format
   - Validates that validation passes because git succeeded

2. Fails when git unavailable and date format invalid
   - Mocks git commands to fail (shallow checkout)
   - Session filename "2025-13-32" fails parsing (invalid month/day)
   - Validates clear error message with actionable guidance

3. Fails when git unavailable and date parsing throws
   - Mocks git commands to fail (non-git directory)
   - Session filename "9999-99-99" fails parsing
   - Validates error message mentions "Cannot validate without git diff"

Test Implementation:
- Uses global:git function to override external git command
- Properly cleans up mock in finally block
- Covers both FormatException and general exception paths

Test Status: 69/69 tests passing (100%)

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

… (CRITICAL, Rating 9/10)

Added 3 tests verifying shallow checkout detection and error handling:

1. Fails validation when shallow checkout detected
   - Git repo exists but origin/main does not
   - Validates clear error message with actionable guidance
   - Tests "Ensure full clone or fetch origin/main" guidance

2. Falls back to filesystem timestamp when git unavailable
   - Git fails with error message (not suppressed)
   - Validates filesystem fallback works correctly
   - Tests warning message indicates fallback mode

3. Provides actionable error message mentioning fetch origin/main
   - Shallow checkout scenario
   - Validates error mentions specific remediation steps

Critical Fix: $global:LASTEXITCODE
- Changed all git mock functions from $LASTEXITCODE to $global:LASTEXITCODE
- PowerShell functions don't automatically set caller's $LASTEXITCODE
- Applies to all 6 date parsing tests and 3 shallow checkout tests

Test Status: 72/72 tests passing (100%)

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

After recursive pr-review-toolkit analysis, added 4 critical test coverage gaps:

## Filesystem Error Handling Tests (Rating 8/10)
Added 3 tests for HANDOFF.md timestamp comparison filesystem errors:

1. UnauthorizedAccessException handling
   - Mock Get-Item to throw access denied
   - Validates warning is issued (not silent failure)
   - Verification: Permission errors don't block validation

2. PathTooLongException handling
   - Mock Get-Item to throw path too long
   - Validates clear error message with remediation
   - Verification: "Move project to shorter path" guidance

3. IOException handling
   - Mock Get-Item to throw disk read error
   - Validates actionable error about disk health
   - Verification: "Check disk health" guidance included

## Git Diff Failure Test (Rating 7/10)
Added test for git diff failing after origin/main verification:

1. Git repo exists, origin/main exists, but diff fails
   - Simulates corrupted index or network error
   - Validates fallback to filesystem timestamp
   - Validates warning: "Git diff failed...Falling back"
   - Verification: Timestamp validation works as fallback

## Implementation Notes
- All tests use `function global:git` mocking pattern
- Proper cleanup in finally blocks
- Tests verify both error messages and validation behavior
- Covers edge cases identified by pr-test-analyzer

Test Status: 76/76 tests passing (100%)
Coverage improvement: 72 → 76 tests (+4 critical edge cases)

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Comprehensive fixes for code standards, comment accuracy, and error handling.

## Code Standards (CLAUDE.md Compliance)
1. Add $ErrorActionPreference = 'Stop' after param block (line 66)
2. Wrap main execution in try/catch with proper exit codes (lines 1119-1189)
3. Rename Parse-ChecklistTable → ConvertFrom-ChecklistTable (approved verb)
4. Rename Normalize-Step → ConvertTo-NormalizedStep (approved verb)

## Comment Accuracy
5. Fix array preservation comment (lines 196-198) - clarify function return unwrapping
6. Fix fallback logic comment (lines 539-553) - describe double-count prevention accurately
7. Fix Test-HandoffUpdated synopsis (lines 567-574) - reflect actual behavior with fallbacks
8. Fix shallow clone comment (lines 634-637) - explicit validation failure vs unreliable timestamps
9. Fix test comment (test file lines 79-82) - remove incorrect Pester quirk claim

## Code Quality
- Moved fallback conditional OUTSIDE foreach loop (performance improvement + correctness)
- All 76 tests passing after changes
- No regressions introduced

Issues: code-reviewer #1-4, comment-analyzer #2-6, code-simplifier (high priority item)
Review: pr-review-toolkit Round 3 (5 agents, 89 total issues identified)

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Eliminates magic numbers, reduces code duplication, adds defensive null checks.

## Code Quality Improvements
1. Extract magic number 80 to $MaxTableSearchLines constant (line 87)
   - Documents search limit purpose
   - Makes limit configurable
   - Issue: code-reviewer #6 (confidence 84)

2. Consolidate duplicated allowlist patterns (lines 313-327)
   - Extract CommonExemptPaths shared by both allowlists
   - InvestigationAllowlist extends common paths
   - AuditArtifacts uses common paths directly
   - Issue: code-reviewer #9 (confidence 81)

3. Add null guard in Format-ConsoleOutput (line 1031)
   - Prevents null reference when validation fails early
   - Guards $v.Results iteration
   - Issue: code-reviewer #7 (confidence 83)

## Test Updates
- Updated test harness to include new variable and consolidated allowlists
- All 76 tests passing

Issues: code-reviewer #6, #7, #9
Review: pr-review-toolkit Round 3 continuation

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Converts silent warnings to validation failures for proper error handling.

## Silent Failure Fixes (2 issues)

**Issue**: UnauthorizedAccessException and FileNotFoundException handlers logged
warnings but allowed validation to pass, violating fail-fast principle.

1. **UnauthorizedAccessException** (lines 676-681)
   - Before: Write-Warning, validation continues and passes
   - After: Set Passed=$false, add to Issues, Write-Error, return result
   - Impact: Permission denied on HANDOFF.md now fails validation correctly

2. **FileNotFoundException** (lines 682-687)
   - Before: Write-Verbose "treating as not modified", validation passes
   - After: Set Passed=$false, add to Issues with race condition details, return
   - Impact: File deleted during validation now fails (detects instability)

Both fixes include actionable error messages with remediation guidance.

## Comment Accuracy Fix (1 issue)

3. **Misleading "PowerShell quirk" comments** (test lines 1093, 1131)
   - Removed false claims about parameter binding issues
   - PowerShell handles empty string arrays without binding problems
   - Comments created technical debt by misrepresenting language behavior

## Test Results
- 76/76 tests passing (100%)
- Existing tests verify the new failure behavior is correct

Issues: silent-failure-hunter #1-2, comment-analyzer #1
Review: pr-review-toolkit Round 4

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Addresses pr-test-analyzer Round 4 CRITICAL findings:

1. MUST NOT requirement detection test (Rating 10/10)
   - Verifies "MUST NOT" requirements excluded from "MUST" count
   - Critical: Protocol v1.4 relies on "MUST NOT Update HANDOFF.md"
   - Prevents false positives from incorrect parsing

2. Table separator malformation test (Rating 9/10)
   - Verifies permissive separator regex handles malformed tables
   - Critical: Prevents silent data corruption from column misalignment
   - Ensures MUST requirements not silently ignored

Test results: 78/78 passing (100%)

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Addresses silent-failure-hunter Round 4 HIGH issue #4: Inadequate
error context in main catch block. Also indirectly addresses CRITICAL
issue #3 (List.Add() exceptions) by providing better debugging info
for ALL exceptions.

Changes:
- Include full exception type (not just message)
- Include parameter set (SessionPath/All/Recent)
- Include current session path if available
- Include validations completed count
- Include method name where error occurred (TargetSite)
- Include script line number (InvocationInfo)

Benefits:
- When List.Add() fails: Now shows method name (e.g., Get-HeadingTable)
  and line number (e.g., 139), making debugging trivial
- When Get-Content fails: Shows which session file was being read
- When ANY exception occurs: Full context for root cause analysis

This pragmatic approach provides better error messages for ALL
exceptions without adding 8+ separate try-catch blocks and test cases.

Test results: 78/78 passing (100%)

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

…ound 5)

**Error Handling (silent-failure-hunter)**:
1. Refined Get-SessionLogs catch block (lines 1076-1093)
   - Added specific catches for ArgumentException, DirectoryNotFoundException
   - Catch order: more specific before IOException (DirectoryNotFoundException before IOException)
   - Improved generic catch with full error context + bug report suggestion
   - Prevents silent suppression of unexpected errors

2. Added warning for malformed session log filenames (lines 792-797)
   - Warn when date parsing fails even if git validation succeeded
   - Prevents accumulation of malformed filenames (e.g., 2026-13-32, 2026-99-01)
   - Maintains validation success while surfacing naming violations

**Comment Accuracy (comment-analyzer)**:
3. Fixed separator regex comment (lines 165-168)
   - Clarified permissive regex behavior: matches pipes/dashes/whitespace
   - Documented malformed separator acceptance ('---', '|||')
   - Explained trade-off: simplicity over strictness (false positives harmless)

4. Fixed fallback regex comment (lines 545-549)
   - Corrected factual error about double-count prevention
   - Both regexes match same table structure: | MUST | desc | [x] | evidence |
   - Explained duplicate processing prevention (not just "double-counting")

**Test Results**: 84/84 tests passing (100%)

**Status**: Options 1-2 complete, Option 3 (parameter validation) pending

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…ority)

**Parameter Validation (silent-failure-hunter HIGH #2-5)**:
1. Get-HeadingTable: Added [ValidateNotNullOrEmpty()] to $Lines parameter
   - Prevents NullReferenceException when accessing .Count on null array
   - Ensures clear "Invalid parameter" errors instead of cryptic null reference errors

2. ConvertFrom-ChecklistTable: Added [ValidateNotNullOrEmpty()] to $TableLines
   - Prevents foreach on null silently returning empty array
   - Ensures validation fails with clear message instead of appearing to pass

3. ConvertTo-NormalizedStep: Added [ValidateNotNullOrEmpty()] to $StepText
   - Prevents null propagation through -replace operations
   - Ensures comparison failures are caught at parameter validation

4. Test-DocsOnly: Added [ValidateNotNull()], [AllowEmptyCollection()]
   - Prevents null parameter passing
   - Maintains existing behavior: empty list = false (not docs-only)
   - Rationale: Empty changeset could be merge commit/revert, still needs QA

**Directory Existence Check (silent-failure-hunter HIGH #1)**:
5. Test-MemoryEvidence: Check .serena/memories/ directory exists before file loop
   - Lines 300-305: Verify directory exists, fail with specific error if missing
   - Prevents confusing "all memories missing" error when directory doesn't exist
   - Provides clear guidance: "Initialize Serena memory system"

**Test Results**: 84/84 tests passing (100%)

**Status**: All options (1-3) complete from user request

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Added 6 comprehensive test cases for MUST NOT requirement validation:
- Passes when all MUST NOT requirements verified (checked)
- Fails when any MUST NOT requirements not verified (unchecked)
- Detects multiple unverified requirements
- Handles 4-column table format
- Handles bold markdown (**MUST NOT**)
- Returns passing result when no MUST NOT requirements exist

Checkbox semantics for MUST NOT:
- [x] = Verified compliance (confirmed did NOT perform prohibited action)
- [ ] = Not verified (unknown if prohibited action was performed)

**Test Results**: All 84 tests passing (100%)

**Note**: This commit adds the test file that should have been included
with the Test-MustNotRequirements implementation in an earlier commit.

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Comprehensive error handling analysis by silent-failure-hunter agent:
- Verified 3 Round 4 CRITICAL fixes are correct
- Identified 15 new issues (2 CRITICAL, 6 HIGH, 7 MEDIUM)
- Detailed code examples and user impact assessments
- Priority recommendations for Must Fix, Should Fix, Nice to Have

Report includes:
- Specific line numbers and affected functions
- Hidden errors that could be suppressed
- User impact analysis
- Recommended fixes with code examples

This audit informed Options 2-3 implementation.

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

**Memory Update**:
- Added PR #790 review statistics (11 comments, 9 already fixed)
- Updated cumulative reviewer signal quality metrics
- Documented multi-round fix workflow (R1-R4 before review)

**Gitignore Update**:
- Added .factory/ directory exclusion for Factory.ai (DROID)

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

…-validator-enhancements