Alecazam

I really like the ideas you have in n2. Hashing the entire build string is a great idea. And it really is as simple as just having all the timestamps of the inputs in the hash. And you have the output timestamp as a quick test.

I feel like make/ninja suffer from the same output modstamp > input modstamps to rebuild. Really a build system should track modstmaps on all inputs (apps included), and the rebuild on not-equal.

Would be nice to see build2 go this route.