@spec decode_personality(String.t() | nil) :: personality() | nil

@spec decode_trust_level(String.t() | nil) :: trust_level() | nil

@spec decode_web_search_mode(String.t() | nil) :: web_search_mode()

@spec encode_personality(personality()) :: String.t()

@spec encode_trust_level(trust_level()) :: String.t()

@spec encode_web_search_mode(web_search_mode()) :: String.t()