Units dont come randomnly, they are there because something in the source file was best represented using that particular unit. As for number of decimal points, I dont quite understand what the issue is, am sure you know that 1.5 is really 1.500000000000 so 1.51234567 is the same level of precision as 1.5. THere is no difference in terms of forcing anything on reflowable text between 1.5 and 1.51234567.
Or maybe you just dont like looking at numbers with lots of decimals?
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