[valenterry]

Stability in this context means "can make changes with confidence in the absence of tests". The more confident you can be, the more stable. Maybe not the right word though.

> Repl driven development is as much about exploring the problem than it is writing code.

Which is exactly what types give you. This even coined the term "type driven development" (same as "test driven development" on purpose").

[tome]

> Stability in this context means "can make changes with confidence in the absence of tests". The more confident you can be, the more stable. Maybe not the right word though.

I'd call it "robustness".