class Temple::Filters::Encoding

def call(s)
  if options[:encoding] && s.respond_to?(:encoding)
    old_enc = s.encoding
    s = +s
    s.force_encoding(options[:encoding])
    # Fall back to old encoding if new encoding is invalid
    unless s.valid_encoding?
      s.force_encoding(old_enc)
      s.force_encoding(::Encoding::BINARY) unless s.valid_encoding?
    end
  end
  s
end