[Rpm-maint] [rpm-software-management/rpm] version comparison with epoch does not work as expected (#450)

[Jeff Johnson]

Lets at least get the facts straight.

Any comparison system that permits missing values has to supply a default value when a value is missing.

There are 2 obvious defaults for a missing epoch in a comparison:
1) use the same, known value, when comparing a missing epoch with a known epoch. This is equivalent to ignoring epochs when missing.
2) make a missing epoch equivalent to 0

Either solution "works" and gives well defined results to EVR comparison.

The change was made to treat a missing epoch as 0 was made to simplify explanations demanded by users incapable of determining the meaning of "same" but able to comprehend "zero".

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