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e775f7e256
Add a new boolean option 'keep-shorter' to preserve fragments shorter than kmer-size during split/extract mode. This change introduces a new flag _lowmaskKeepShorter that controls whether fragments shorter than the kmer size should be kept during split/extract operations. The implementation: 1. Adds the new boolean variable _lowmaskKeepShorter 2. Registers the command-line option "keep-shorter" 3. Updates the lowMaskWorker function signature to accept the keepShorter parameter 4. Modifies the fragment selection logic to check the keepShorter flag 5. Updates the worker creation to pass the global flag value This allows users to control the behavior when dealing with short sequences in split/extract modes, providing more flexibility in low-complexity masking.