Correct misc TODOs in monero-serai

coins/monero/src/block.rs

@@ -83,7 +83,7 @@ impl Block {
   ///
   /// This information comes from the Block's miner transaction. If the miner transaction isn't
   /// structed as expected, this will return None.
-  pub fn number(&self) -> Option<u64> {
+  pub fn number(&self) -> Option<usize> {
     match &self.miner_transaction {
       Transaction::V1 { prefix, .. } | Transaction::V2 { prefix, .. } => {
         match prefix.inputs.first() {

coins/monero/src/transaction.rs

@@ -20,7 +20,7 @@ use crate::{
 #[derive(Clone, PartialEq, Eq, Debug)]
 pub enum Input {
   /// An input for a miner transaction, which is generating new coins.
-  Gen(u64),
+  Gen(usize),
   /// An input spending an output on-chain.
   ToKey {
     /// The pool this input spends an output of.