[markfasheh/duperemove] Why blocksize is limit to 1MB?

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Hello, i have a 8 TB volume with multiple files with hundreds of GB each.
I try to dedupe this because the first hundred GB of many files are identical.
With 128KB blocksize with nofiemap and lookup-extends=no option, will
take more then a week (only dedupe, previously hashed). So i tryed -b
100M but this returned me an error: "Blocksize is bounded ...".

The reason is that the blocksize is limit to

#define MAX_BLOCKSIZE (1024U*1024)

But i can't found any description why.
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