gistfile1

# -*- encoding: utf-8 -*-
#
# -

require 'psych'

ary = ["Jakub Kuźma", "Timo Rößner"]
p ary.first.encoding

builder = Psych::Visitors::YAMLTree.new({})
builder << ary
ast = builder.tree

io = StringIO.new

Psych::Visitors::Emitter.new(io).accept(ast)

str = io.string
p str
p str.encoding

str.gsub(/ !!null \n/, " \n")