Add specs for where Fiber#transfer returns control - #1397
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A Fiber entered by Fiber#transfer has no resumer, so when it finishes or is killed, control goes to the innermost Fiber reachable from the root Fiber by following resumes, which is not necessarily the Fiber that transferred. Also covers a transferring Fiber that was itself entered by Fiber#raise.
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A Fiber entered by Fiber#transfer has no resumer, so when it finishes or is killed, control goes to the innermost Fiber reachable from the root Fiber by following resumes, which is not necessarily the Fiber that transferred. Also covers a transferring Fiber that was itself entered by Fiber#raise.