Provides generic BSON value copying between readers and writers without reflection. Implements an efficient visitor pattern that handles all BSON types through type switches, enabling high-performance BSON manipulation. This isolated component could be extracted for any BSON processing task.

Contains assertion helper functions for testing with clear error messages and formatting. Implements a clean, extensible assertion framework that could be used in any Go testing scenario. The component demonstrates good testing practices with minimal dependencies.

Implements the functional options pattern for configuring MongoDB clients. Uses []func(*ClientOptions) error to enable flexible, zero-overhead configuration. This pattern is consistently applied throughout the options packages and represents an idiomatic Go approach to configurable APIs.

Defines a pluggable logger interface that allows applications to integrate their preferred logging framework (Zap, Zerolog, etc.). The component demonstrates clean dependency injection with a minimal interface (LogError, LogDebug, etc.) that can be easily implemented by any logging library.

Defines interfaces for command and pool monitoring that enable application-level observability of MongoDB operations. Implements the observer pattern allowing clients to register monitors that receive events for commands sent, connection pool changes, and other driver activities.