function getDecodeSplit (name, list) {
  // 1. Let value be the result of getting name from list.
  const value = list.get(name, true)

  // 2. If value is null, then return null.
  if (value === null) {
    return null
  }

  // 3. Return the result of getting, decoding, and splitting value.
  return gettingDecodingSplitting(value)
}
@see https://fetch.spec.whatwg.org/#concept-header-list-get-decode-split
@param {string} name lowercase header name
@param {import('./headers').HeadersList} list