Writer.

A writer is a push-based stream of bytes. Give it an output channel and it will write the bytes in it.

This is useful for responses: an http endpoint can return a writer as its response's body, and output into it as if it were a regular out_channel, including controlling calls to flush.

• since 0.14

Write into the channel.

Empty writer, will output 0 bytes.

A writer that just emits the bytes from the given string.