Put That All Together

All of the parts explored here exist, but not in the same place. Putting these together is a significant undertaking; building message passing and delegation between objects in separate processes may only take a few source lines, design-by-contract is a judicious application of the assert() statement, but a whole interactive environment to allow live development and debugging of such a system is a much bigger undertaking. So why consider it?

Speed

When the development environment and the deployment environment are the same, developers get a higher fidelity experience that makes turnaround time on development lower by reducing the likelihood that a change will "break in CI" (or even in production) due to differences in the environments.

The people using the software can have higher confidence too, because they know that the developer has built the thing in the same environment it will be used in. Additionally, the use of contracts in this proposed development...