@type openapi_field() :: %{
  :default => term(),
  optional(:description) => String.t() | nil,
  optional(:deprecated) => boolean(),
  optional(:example) => term(),
  optional(:examples) => term(),
  optional(:external_docs) => map() | nil,
  optional(:extensions) => map(),
  :name => String.t(),
  :nullable => boolean(),
  optional(:read_only) => boolean(),
  :required => boolean(),
  :type => term(),
  optional(:write_only) => boolean()
}