Utilities and data structures

Packages for data structures and utility types.

• box2d - Box2D-compatible rigid-body worlds, bodies, and fixtures.

• map - An ordered key-value map type.

• set - A set type.

• option - Optional values (some/none).

• result - Success/error result values.

• retry - Bounded retries with exponential backoff and jitter.

• ptr - Low-level pointer operations.