KZDev 

Performance utilities for .NET projects, including the MemoryStreamSlim, StringBuilderCache, InterlockedOps, and Compression classes.

PrimeTime superset: contracts plus NodaTime clocks (IPrimeClock/PrimeClock) with NodaTime overloads. Prefer KZDev.SystemClock.PrimeTime for a BCL-only subset.

Virtual-time test clock and contracts for KZDev.PrimeTime (NodaTime).

PrimeTime strict BCL subset: shared IPrimeClock/PrimeClock model using TimeProvider only; no NodaTime. Prefer KZDev.PrimeTime for the NodaTime superset.

Virtual-time test clock and contracts for KZDev.SystemClock.PrimeTime (BCL subset).