observation journal: countable?

[David Buchmann]

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hi,

i just created https://github.com/phpcr/phpcr/pull/62

besides making clear that skipTo is using milliseconds, i propose to
drop the countable interface from the event journal. it is very
expensive to know the number of events that are in a journal, there
could be a huge number.

comments welcome.

cheers,david
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