@type t() :: %PolarExpress.Schemas.S3FileUploadPart{
  checksum_sha256_base64: String.t() | nil,
  chunk_end: integer() | nil,
  chunk_start: integer() | nil,
  expires_at: DateTime.t() | nil,
  headers: %{required(String.t()) => String.t()} | nil,
  number: integer() | nil,
  url: String.t() | nil
}