stream,doc: make `writable.setDefaultEncoding()` return `this`
Let this function return this
for parity with readable.setEncoding()
though they set encodings for different purposes. (#5013 (closed)).
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Let this function return this
for parity with readable.setEncoding()
though they set encodings for different purposes. (#5013 (closed)).