[S02] make Instant completely opaque as suggested by ruoso++. Instants are now considered a more type basic than epochs, which are just particular named instants.  All culturally aware time can be based on calculations involving instants and durations. (Durations are still considered interconvertible with Reals.)
[S02] make Instant completely opaque as suggested by ruoso++.
Instants are now considered a more type basic than epochs, which
are just particular named instants.  All culturally aware time
can be based on calculations involving instants and durations.
(Durations are still considered interconvertible with Reals.)


git-svn-id: 53605643c415f7495558be95614cf14171f1db78@29809 c213334d-75ef-0310-aa23-eaa082d1ae64

prammer/specs,perl6/specs,tokuhirom/specs,tokuhirom/specs,prammer/specs,perl6/specs,prammer/specs,tokuhirom/specs