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-m3: check matches by VMAC digest (compression memory = 7-8% of filesize)
-m5: rereading with byte-accurate matches (compression memory = 7-9% of filesize)
-aX[/Y]: alloc X bytes of those Y bits will be set per L input bytes for compression accelerator
Y=0/1/2/4/8/16/32/64, -a0 is slowest but requires least memory
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