Bug: endless Joined

See #370, release log:

• 5780a08 by @yegor256: #370 reproduced and fixed Join...
• 5c93fcf: Refactoring Code #397
• 3d55af7: Removing redundant newline #39...
• fa73bde: Add test cases #397
• 6738be9: Implementing Input output #397
• 386b74b: Implementing TeeReader #397
• 34b1ffd by @rultor: Merge branch '__rultor'

Released by Rultor 1.66.1, see build log