split method - more accurate description #3
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At first I did not understand the meaning of this method from the documentation, and at first I thought that the address was simply broken into pieces of exponent bits. But looking at the code, I realized that it is generally intended for another. Apparently this method was used to divide the networks into subnets a exponent bits additionally? Then my comment more accurately reflects the meaning IMHO.
And the target_length is not used in source. I think it's old removed variable. Please check up this!