/// <summary>
/// Attempts to acquire an UPGRADE lock synchronously. Not compatible with another UPGRADE lock or a WRITE lock. Usage:
/// <code>
/// using (var handle = myLock.TryAcquireUpgradeableReadLock(...))
/// {
/// if (handle != null) { /* we have the lock! */ }
/// }
/// // dispose releases the lock if we took it
/// </code>
/// </summary>
/// <param name="timeout">How long to wait before giving up on the acquisition attempt. Defaults to 0</param>
/// <param name="cancellationToken">Specifies a token by which the wait can be canceled</param>
/// <returns>A <see cref="SqlDistributedReaderWriterLockUpgradeableHandle"/> which can be used to release the lock or null on failure</returns>
public SqlDistributedReaderWriterLockUpgradeableHandle?TryAcquireUpgradeableReadLock(TimeSpan timeout = default, CancellationToken cancellationToken = default) =>
DistributedLockHelpers.TryAcquireUpgradeableReadLock(this, timeout, cancellationToken);