Fix is_ordered flag

Fixes is_ordered flag behavior (now reversed); adds tests; bumps version.
I do wonder about making this a weaker default.

Although this maintains the prior behavior, the expectation has been that by default ordering is checked (although it was not carried out correctly)  If there is something out-of-order, it would have been succeeding and by-rights should be failing I think.

I think I'd prefer to see any place where ordering does not matter have to change and be identified.