| handle | The AtomicSafetyHandle to check. |
Checks that the handle has been initialized, and if so, checks that it is still valid.
This is almost identical to AtomicSafetyHandle.IsValidNonDefaultHandle, except that if the AtomicSafetyHandle has been initialized
but isn't valid, then an ObjectDisposedException is thrown instead of returning false.
If the handle hasn't been initialized, then this method does nothing. Use AtomicSafetyHandle.IsDefaultValue to check whether a handle is uninitialized.