class ElasticAPM::TraceContext::Tracestate

def split_by_nl_and_comma(str)
  # HTTP allows multiple headers with the same name, eg. multiple
  # Set-Cookie headers per response.
  # Rack handles this by joining the headers under the same key,
  # separated by newlines.
  # See https://www.rubydoc.info/github/rack/rack/file/SPEC
  String(str).split("\n").map { |s| s.split(',') }.flatten
end