diff --git a/src/numberparse/correct.rs b/src/numberparse/correct.rs
index 4d2f9237..b7706256 100644
--- a/src/numberparse/correct.rs
+++ b/src/numberparse/correct.rs
@@ -191,11 +191,12 @@ impl<'de> Deserializer<'de> {
         } else if is_structural_or_whitespace(get!(buf, idx)) == 0 {
             err!(idx, get!(buf, idx))
         } else {
-            Ok(StaticNode::I64(if negative {
-                unsafe { static_cast_i64!(num.wrapping_neg()) } // -(num as i64)
+            Ok(if negative {
+                StaticNode::I64(unsafe { static_cast_i64!(num.wrapping_neg()) })
+            // -(num as i64)
             } else {
-                num as i64
-            }))
+                StaticNode::U64(num)
+            })
         }
     }
 }
@@ -238,7 +239,6 @@ fn parse_large_integer(
         (true, 9_223_372_036_854_775_808) => Ok(StaticNode::I64(i64::MIN)),
         (true, 9_223_372_036_854_775_809..=u64::MAX) => err!(idx, get!(buf, idx)),
         (true, 0..=9_223_372_036_854_775_807) => Ok(StaticNode::I64(-(num as i64))),
-        (false, 0..=9_223_372_036_854_775_807) => Ok(StaticNode::I64(num as i64)),
         (false, _) => Ok(StaticNode::U64(num)),
     }
 }
@@ -404,6 +404,7 @@ mod test {
     use crate::value::owned::Value::Static;
     use value_trait::StaticNode::F64;
     use value_trait::StaticNode::I64;
+    use value_trait::StaticNode::U64;
 
     fn to_value_from_str(buf: &str) -> Result<Value, Error> {
         let mut val = String::from(buf);
@@ -530,7 +531,7 @@ mod test {
 
     #[test]
     fn zero_int() -> Result<(), crate::Error> {
-        assert_eq!(to_value_from_str("0")?, Static(I64(0)));
+        assert_eq!(to_value_from_str("0")?, Static(U64(0)));
         Ok(())
     }
 
@@ -545,8 +546,9 @@ mod test {
 
     #[test]
     fn int() -> Result<(), crate::Error> {
-        assert_eq!(to_value_from_str("1")?, Static(I64(1)));
-        assert_eq!(to_value_from_str("257")?, Static(I64(257)));
+        assert!(matches!(to_value_from_str("1")?, Static(U64(1))));
+        assert_eq!(to_value_from_str("-1")?, Static(I64(-1)));
+        assert_eq!(to_value_from_str("257")?, Static(U64(257)));
         Ok(())
     }
 
diff --git a/src/serde.rs b/src/serde.rs
index e3cc2d7b..e4536b19 100644
--- a/src/serde.rs
+++ b/src/serde.rs
@@ -100,6 +100,7 @@ where
 {
     let mut deserializer = stry!(Deserializer::from_slice(s.as_bytes_mut()));
 
+    dbg!(&deserializer.tape);
     T::deserialize(&mut deserializer)
 }
 
@@ -222,7 +223,8 @@ impl<'de> Deserializer<'de> {
     #[cfg_attr(not(feature = "no-inline"), inline)]
     #[allow(clippy::cast_sign_loss)]
     fn parse_u16(&mut self) -> Result<u16> {
-        match unsafe { self.next_() } {
+        let next = unsafe { self.next_() };
+        match next {
             Node::Static(s) => s
                 .as_u16()
                 .ok_or_else(|| Self::error(ErrorType::ExpectedUnsigned)),
diff --git a/src/serde/de.rs b/src/serde/de.rs
index c5c9fba8..9c94e559 100644
--- a/src/serde/de.rs
+++ b/src/serde/de.rs
@@ -576,3 +576,6 @@ impl<'de, 'a> de::Deserializer<'de> for MapKey<'de, 'a> {
         struct identifier ignored_any
     }
 }
+
+#[cfg(test)]
+mod tests;
diff --git a/src/serde/de/tests.rs b/src/serde/de/tests.rs
new file mode 100644
index 00000000..3367c93a
--- /dev/null
+++ b/src/serde/de/tests.rs
@@ -0,0 +1,109 @@
+use serde::{
+    de::{Error as DeError, Visitor},
+    Deserialize, Deserializer,
+};
+use std::fmt::{Formatter, Result as FmtResult};
+
+const JSON: &str = r#"{
+    "channels": [
+      {
+        "default_auto_archive_duration": 10080
+      }
+    ],
+    "unavailable": false
+}"#;
+
+#[derive(Clone, Debug, Deserialize, Eq, PartialEq)]
+#[serde(untagged)]
+pub enum GuildCreate {
+    Available(Guild),
+    Unavailable(UnavailableGuild),
+}
+
+#[derive(Clone, Debug, Deserialize, Eq, Hash, PartialEq)]
+pub struct UnavailableGuild {
+    pub unavailable: bool,
+}
+
+#[derive(Clone, Debug, Eq, PartialEq, Deserialize, Hash)]
+pub struct Guild {
+    pub channels: Vec<Channel>,
+}
+
+#[derive(Clone, Debug, Deserialize, Eq, Hash, PartialEq)]
+pub struct Channel {
+    pub default_auto_archive_duration: Option<AutoArchiveDuration>,
+}
+
+#[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
+// Fix 1: Uncomment this and comment the handwritten deser impl.
+// #[derive(Deserialize)]
+// #[serde(from = "u16")]
+pub enum AutoArchiveDuration {
+    Hour,
+    Day,
+    ThreeDays,
+    Week,
+    Unknown { value: u16 },
+}
+
+impl From<u16> for AutoArchiveDuration {
+    fn from(value: u16) -> Self {
+        match value {
+            60 => Self::Hour,
+            1440 => Self::Day,
+            4320 => Self::ThreeDays,
+            10080 => Self::Week,
+            value => Self::Unknown { value },
+        }
+    }
+}
+
+impl<'de> Deserialize<'de> for AutoArchiveDuration {
+    fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
+        deserializer.deserialize_u16(U16EnumVisitor).map(u16::into)
+    }
+}
+
+pub struct U16EnumVisitor;
+
+impl<'de> Visitor<'de> for U16EnumVisitor {
+    type Value = u16;
+
+    fn expecting(&self, f: &mut Formatter<'_>) -> FmtResult {
+        f.write_str("u16")
+    }
+
+    fn visit_u16<E: DeError>(self, value: u16) -> Result<Self::Value, E> {
+        Ok(value)
+    }
+
+    fn visit_u64<E>(self, v: u64) -> Result<Self::Value, E>
+    where
+        E: DeError,
+    {
+        v.try_into().map_err(DeError::custom)
+    }
+
+    // Fix 2: Uncomment this
+    // fn visit_i64<E>(self, v: i64) -> Result<Self::Value, E>
+    // where
+    //     E: DeError,
+    // {
+    //     v.try_into().map_err(DeError::custom)
+    // }
+}
+
+#[test]
+fn test_deser_u16() -> Result<(), Box<dyn std::error::Error>> {
+    unsafe {
+        let mut json = JSON.to_string();
+        let a = dbg!(crate::from_str::<Guild>(&mut json)?);
+        let b = dbg!(crate::from_str::<UnavailableGuild>(&mut json)?);
+        let c = dbg!(crate::from_str::<GuildCreate>(&mut json)?);
+        assert_eq!(a, serde_json::from_str::<Guild>(&json)?);
+        assert_eq!(b, serde_json::from_str::<UnavailableGuild>(&json)?);
+        assert_eq!(c, serde_json::from_str::<GuildCreate>(&json)?);
+    };
+    Ok(())
+}