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Reviewing files that changed from the base of the PR and between f206dc3 and e48c306.

• src/NLog/Targets/FileArchiveHandlers/BaseFileArchiveHandler.cs (1 hunks)

src/NLog/Targets/FileArchiveHandlers/BaseFileArchiveHandler.cs (2)

209-214: Clean optimization for non-digit character comparison.

The conditional check x_chr != y_chr before performing ToUpperInvariant is a sensible micro-optimization that avoids unnecessary case conversions when characters are already identical. The logic correctly handles all cases:

• Identical characters: skip comparison, advance positions
• Different characters but case-insensitively equal (e.g., 'A' vs 'a'): cmpChar == 0, continue
• Genuinely different characters: return comparison result

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165-221: The simplified NaturalStringComparer is correct and well-structured.

The method correctly handles:

• Null/equal-length early exit with standard case-insensitive comparison (lines 167-168)
• Numeric block natural ordering with leading zero handling (lines 179-206)
• Case-insensitive non-digit comparison (lines 209-214)
• Length-based fallback when one string is exhausted (line 220)

The removal of prefix-skipping optimization (per the PR objective to simplify) is appropriate—the performance difference is negligible for typical file archive naming patterns, and the simpler code is easier to maintain.