Property SkipUnchangedByTimestamp
SkipUnchangedByTimestamp
OFF: correctness beats speed. Matching size and mtime is not evidence a file is unchanged — mtime-preserving copy tools, two-second filesystem granularity, restore-from-backup — and the hash gate is already one sequential 64 KiB-buffered read.
public bool SkipUnchangedByTimestamp { get; set; }