Why all this misunderstanding about < 10 digits for UnitID or CID?
In a mathematical numeric set of 10 "whole numbers" (natural numbers including 0) and 10 digit positions then you can include OR EXCLUDE the first leading zeroes.
CardID/CID like "12345678" is actually also "0012345678" in a 10 digit domain. So it's still 10 digits with suppression of the two leading 0's in this case. In this 10 position math space it's equaly important with leading 0's as with trailing 0's. However in our math notation it's very common to write the shorter truncated version when we have leading 0's since we understand the value in booth cases.
Whole numbers:
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Zero suppression:
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