pub fn get_u64<S: BuildHasher>(
json_block: &HashMap<&str, JSONValue<'_, S>, S>,
field: &str,
) -> Result<u64, ParseJsonError>pub fn get_u64<S: BuildHasher>(
json_block: &HashMap<&str, JSONValue<'_, S>, S>,
field: &str,
) -> Result<u64, ParseJsonError>