t() :: %Protobuf.FieldProps{
  default: any(),
  embedded?: boolean(),
  encoded_fnum: iodata(),
  enum?: boolean(),
  fnum: integer(),
  map?: boolean(),
  name: String.t(),
  name_atom: atom(),
  oneof: non_neg_integer() | nil,
  optional?: boolean(),
  packed?: boolean(),
  repeated?: boolean(),
  required?: boolean(),
  type: atom(),
  wire_type: 0..5
}