show(@key stream = current_writer(), quotes = false, obj1, ...)
Write the textual representation of the objects obj1 ... to the output-stream stream.
If quotes is true, output the enclosing quotes for strings and symbols.
After writing obj1 ..., return void.
show("hello, world")
//> hello, world
show(quotes = true, "hello, world")
//> "hello, world"