Explore ways to optimize validation and allowance flow.

[shawnbrown]

Once major pieces are in place, explore ways of optimizing the validation/allowance process. Look to implement the following possible improvements:

• Use lazy evaluation in validate and assertion functions by returning generators instead of fully calculated containers.
• Create optimized _validate...() functions for faster testing (short-circuit evaluation and Boolean return values) rather than using _compare...() functions in all cases.

[shawnbrown]

This is being addressed by the new DataResult and DataQuery classes.

[shawnbrown]

This has been largely addressed in the current data handling implementation:

• DataResult wrapper for iterables.
• Conditional evaluation.
• Lazy defaults where sensible.