Thread-safe atomic counter using Interlocked. Zero-allocation reads.

Thread-safe atomic int64 counter. The initial counter value.

Bounded dictionary — auto-evicts the first-inserted key when capacity is reached. Not thread-safe.

Bounded queue — auto-evicts oldest elements when capacity is reached. Not thread-safe.

CancellationToken helpers — reduces boilerplate for timeout + linked patterns.

Generic background worker that processes items sequentially from an internal queue. Fault-tolerant: errors in handlers are reported via callback without crashing the worker. Stops gracefully on cancellation.

Periodic background timer — runs an action at fixed intervals with cancellation.

One-shot async signal. Wraps TaskCompletionSource{T} for idiomatic F# async coordination.

Sliding-window rate limiter. Tracks request count within a time window. Thread-safe on .NET; single-threaded safe on Fable.

Snapshot throttle — tracks message count and triggers save at threshold (thread-safe).