interface config {
    variant value {
        null,
        boolean(bool),
        num(number),
        str(string),
        arr(list<primitive-value>),
        /// There's no native map type in WIT, so we use a list of tuples.
        obj(list<tuple<string, primitive-value>>),
    }

    /// Types cannot be recursive in WIT, so we need to create a
    /// second type for the top-level type to reference.
    variant primitive-value {
        null,
        boolean(bool),
        num(number),
        str(string),
    }

    variant number {
        posint(u64),
        /// Always less than zero.
        negint(s64),
        /// Always finite.
        float(float64),
    }

    /// Returns all config key names.
    config-keys: func() -> list<string>;
    /// Returns the named config value.
    config-var: func(key: string) -> option<value>;
    /// Returns the number of proxy hops expected exterior to Bulwark.
    proxy-hops: func() -> u8;
}