05 — Purity at the seams

After this lesson you will be able to say why every fallible function in Loom returns a Result instead of throwing, name the one property that decides what belongs in a CompositionRuntime, explain the difference between a log and an audit trail, say where Loom throws on purpose and why those cases are not exceptions to the rule, and tell an obligation from a guarantee when both are written in the same sentence.

Prerequisites: 01, 02, 03, 04.