v2.0.1

Fixes:

• Fixed a memory leak with All/Merge/Race/First promises when object pooling is enabled.
• Fixed state check in PromiseYieldInstruction when the promise is already complete.

Optimizations:

• Less pooled memory when T of Promise<T> is a reference type and used by more than 1 types (example: Promise<string> and Promise<object>).
• More efficient execution in the common case.