module Kernel

def jj(*objs)

indentation and over many lines.
Outputs _objs_ to STDOUT as JSON strings in a pretty format, with

def jj(*objs)
  if RUBY_VERSION >= "3.0"
    warn "Kernel#jj is deprecated and will be removed in json 3.0.0", uplevel: 1, category: :deprecated
  else
    warn "Kernel#jj is deprecated and will be removed in json 3.0.0", uplevel: 1
  end
  objs.each do |obj|
    puts JSON.pretty_generate(obj, :allow_nan => true, :max_nesting => false)
  end
  nil
end

Instance Methods