v0.8.1

Added blockInPlace for running blocking functions on the thread pool without allocations.
Added os.thread.yield() for yielding to the kernel from OS-level threads.

Removed LIFO slot optimization in the coroutine scheduler, to simplify the code while planning to rework the scheduler.
Added check that prevents coroutines from being called multiple times per one event loop iteration.
Internal refactoring of our WaitQueue primitive, to better express the semantics we need for synchronization primitives like Mutex or Condition.
Internal refactoring of our Waiter primitive, avoiding indirect function calls and more direct integration with select.

Fixed error returned from Group task closing the group, even if not in fail-fast mode.

Added blockInPlace for running blocking functions on the thread pool without allocations.
Added os.thread.yield() for yielding to the kernel from OS-level threads.

Removed LIFO slot optimization in the coroutine scheduler, to simplify the code while planning to rework the scheduler.
Added check that prevents coroutines from being called multiple times per one event loop iteration.
Internal refactoring of our WaitQueue primitive, to better express the semantics we need for synchronization primitives like Mutex or Condition.
Internal refactoring of our Waiter primitive, avoiding indirect function calls and more direct integration with select.

Fixed error returned from Group task closing the group, even if not in fail-fast mode.

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