Adds three TODO comments [minor]

src/sources/selector.rs

@@ -42,6 +42,7 @@ fn source_index_to_confidence(source_index: usize) -> u8 {
 /// we first only compare the two numbers at index 0,
 /// and only if they are equal, we continue the comparison,
 /// looking at the numbers in the second position of the two vectors.
+// TODO Maybe make this use a custom struct as return instead?
 fn valor(validity: &validator::Result, confidence: Confidence, source_index: usize) -> [u8; 4] {
     let res_confs = validator::res_to_confidences(validity);
     [

src/validator.rs

@@ -17,6 +17,8 @@ use url::Url;
 pub type Result = std::result::Result<Validity, Error>;
 pub type Validator = fn(&mut Environment, &str) -> Result;
 
+// TODO Document this function! (hae... what does it do? why two confidences?)
+// TODO Maybe make this use a custom struct as return instead?
 #[must_use]
 pub const fn res_to_confidences(res: &Result) -> [Confidence; 2] {
     match &res {