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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