Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>

1 files changed, 801 insertions, 0 deletions

diff --git a/vendor/serde_json/src/number.rs b/vendor/serde_json/src/number.rs
new file mode 100644
index 0000000..b0231a8
--- /dev/null
+++ b/vendor/serde_json/src/number.rs
@@ -0,0 +1,801 @@
+use crate::de::ParserNumber;
+use crate::error::Error;
+#[cfg(feature = "arbitrary_precision")]
+use crate::error::ErrorCode;
+#[cfg(feature = "arbitrary_precision")]
+use alloc::borrow::ToOwned;
+#[cfg(feature = "arbitrary_precision")]
+use alloc::string::{String, ToString};
+use core::fmt::{self, Debug, Display};
+#[cfg(not(feature = "arbitrary_precision"))]
+use core::hash::{Hash, Hasher};
+use serde::de::{self, Unexpected, Visitor};
+#[cfg(feature = "arbitrary_precision")]
+use serde::de::{IntoDeserializer, MapAccess};
+use serde::{forward_to_deserialize_any, Deserialize, Deserializer, Serialize, Serializer};
+
+#[cfg(feature = "arbitrary_precision")]
+pub(crate) const TOKEN: &str = "$serde_json::private::Number";
+
+/// Represents a JSON number, whether integer or floating point.
+#[derive(Clone, PartialEq, Eq, Hash)]
+pub struct Number {
+    n: N,
+}
+
+#[cfg(not(feature = "arbitrary_precision"))]
+#[derive(Copy, Clone)]
+enum N {
+    PosInt(u64),
+    /// Always less than zero.
+    NegInt(i64),
+    /// Always finite.
+    Float(f64),
+}
+
+#[cfg(not(feature = "arbitrary_precision"))]
+impl PartialEq for N {
+    fn eq(&self, other: &Self) -> bool {
+        match (self, other) {
+            (N::PosInt(a), N::PosInt(b)) => a == b,
+            (N::NegInt(a), N::NegInt(b)) => a == b,
+            (N::Float(a), N::Float(b)) => a == b,
+            _ => false,
+        }
+    }
+}
+
+// Implementing Eq is fine since any float values are always finite.
+#[cfg(not(feature = "arbitrary_precision"))]
+impl Eq for N {}
+
+#[cfg(not(feature = "arbitrary_precision"))]
+impl Hash for N {
+    fn hash<H: Hasher>(&self, h: &mut H) {
+        match *self {
+            N::PosInt(i) => i.hash(h),
+            N::NegInt(i) => i.hash(h),
+            N::Float(f) => {
+                if f == 0.0f64 {
+                    // There are 2 zero representations, +0 and -0, which
+                    // compare equal but have different bits. We use the +0 hash
+                    // for both so that hash(+0) == hash(-0).
+                    0.0f64.to_bits().hash(h);
+                } else {
+                    f.to_bits().hash(h);
+                }
+            }
+        }
+    }
+}
+
+#[cfg(feature = "arbitrary_precision")]
+type N = String;
+
+impl Number {
+    /// Returns true if the `Number` is an integer between `i64::MIN` and
+    /// `i64::MAX`.
+    ///
+    /// For any Number on which `is_i64` returns true, `as_i64` is guaranteed to
+    /// return the integer value.
+    ///
+    /// ```
+    /// # use serde_json::json;
+    /// #
+    /// let big = i64::max_value() as u64 + 10;
+    /// let v = json!({ "a": 64, "b": big, "c": 256.0 });
+    ///
+    /// assert!(v["a"].is_i64());
+    ///
+    /// // Greater than i64::MAX.
+    /// assert!(!v["b"].is_i64());
+    ///
+    /// // Numbers with a decimal point are not considered integers.
+    /// assert!(!v["c"].is_i64());
+    /// ```
+    #[inline]
+    pub fn is_i64(&self) -> bool {
+        #[cfg(not(feature = "arbitrary_precision"))]
+        match self.n {
+            N::PosInt(v) => v <= i64::max_value() as u64,
+            N::NegInt(_) => true,
+            N::Float(_) => false,
+        }
+        #[cfg(feature = "arbitrary_precision")]
+        self.as_i64().is_some()
+    }
+
+    /// Returns true if the `Number` is an integer between zero and `u64::MAX`.
+    ///
+    /// For any Number on which `is_u64` returns true, `as_u64` is guaranteed to
+    /// return the integer value.
+    ///
+    /// ```
+    /// # use serde_json::json;
+    /// #
+    /// let v = json!({ "a": 64, "b": -64, "c": 256.0 });
+    ///
+    /// assert!(v["a"].is_u64());
+    ///
+    /// // Negative integer.
+    /// assert!(!v["b"].is_u64());
+    ///
+    /// // Numbers with a decimal point are not considered integers.
+    /// assert!(!v["c"].is_u64());
+    /// ```
+    #[inline]
+    pub fn is_u64(&self) -> bool {
+        #[cfg(not(feature = "arbitrary_precision"))]
+        match self.n {
+            N::PosInt(_) => true,
+            N::NegInt(_) | N::Float(_) => false,
+        }
+        #[cfg(feature = "arbitrary_precision")]
+        self.as_u64().is_some()
+    }
+
+    /// Returns true if the `Number` can be represented by f64.
+    ///
+    /// For any Number on which `is_f64` returns true, `as_f64` is guaranteed to
+    /// return the floating point value.
+    ///
+    /// Currently this function returns true if and only if both `is_i64` and
+    /// `is_u64` return false but this is not a guarantee in the future.
+    ///
+    /// ```
+    /// # use serde_json::json;
+    /// #
+    /// let v = json!({ "a": 256.0, "b": 64, "c": -64 });
+    ///
+    /// assert!(v["a"].is_f64());
+    ///
+    /// // Integers.
+    /// assert!(!v["b"].is_f64());
+    /// assert!(!v["c"].is_f64());
+    /// ```
+    #[inline]
+    pub fn is_f64(&self) -> bool {
+        #[cfg(not(feature = "arbitrary_precision"))]
+        match self.n {
+            N::Float(_) => true,
+            N::PosInt(_) | N::NegInt(_) => false,
+        }
+        #[cfg(feature = "arbitrary_precision")]
+        {
+            for c in self.n.chars() {
+                if c == '.' || c == 'e' || c == 'E' {
+                    return self.n.parse::<f64>().ok().map_or(false, f64::is_finite);
+                }
+            }
+            false
+        }
+    }
+
+    /// If the `Number` is an integer, represent it as i64 if possible. Returns
+    /// None otherwise.
+    ///
+    /// ```
+    /// # use serde_json::json;
+    /// #
+    /// let big = i64::max_value() as u64 + 10;
+    /// let v = json!({ "a": 64, "b": big, "c": 256.0 });
+    ///
+    /// assert_eq!(v["a"].as_i64(), Some(64));
+    /// assert_eq!(v["b"].as_i64(), None);
+    /// assert_eq!(v["c"].as_i64(), None);
+    /// ```
+    #[inline]
+    pub fn as_i64(&self) -> Option<i64> {
+        #[cfg(not(feature = "arbitrary_precision"))]
+        match self.n {
+            N::PosInt(n) => {
+                if n <= i64::max_value() as u64 {
+                    Some(n as i64)
+                } else {
+                    None
+                }
+            }
+            N::NegInt(n) => Some(n),
+            N::Float(_) => None,
+        }
+        #[cfg(feature = "arbitrary_precision")]
+        self.n.parse().ok()
+    }
+
+    /// If the `Number` is an integer, represent it as u64 if possible. Returns
+    /// None otherwise.
+    ///
+    /// ```
+    /// # use serde_json::json;
+    /// #
+    /// let v = json!({ "a": 64, "b": -64, "c": 256.0 });
+    ///
+    /// assert_eq!(v["a"].as_u64(), Some(64));
+    /// assert_eq!(v["b"].as_u64(), None);
+    /// assert_eq!(v["c"].as_u64(), None);
+    /// ```
+    #[inline]
+    pub fn as_u64(&self) -> Option<u64> {
+        #[cfg(not(feature = "arbitrary_precision"))]
+        match self.n {
+            N::PosInt(n) => Some(n),
+            N::NegInt(_) | N::Float(_) => None,
+        }
+        #[cfg(feature = "arbitrary_precision")]
+        self.n.parse().ok()
+    }
+
+    /// Represents the number as f64 if possible. Returns None otherwise.
+    ///
+    /// ```
+    /// # use serde_json::json;
+    /// #
+    /// let v = json!({ "a": 256.0, "b": 64, "c": -64 });
+    ///
+    /// assert_eq!(v["a"].as_f64(), Some(256.0));
+    /// assert_eq!(v["b"].as_f64(), Some(64.0));
+    /// assert_eq!(v["c"].as_f64(), Some(-64.0));
+    /// ```
+    #[inline]
+    pub fn as_f64(&self) -> Option<f64> {
+        #[cfg(not(feature = "arbitrary_precision"))]
+        match self.n {
+            N::PosInt(n) => Some(n as f64),
+            N::NegInt(n) => Some(n as f64),
+            N::Float(n) => Some(n),
+        }
+        #[cfg(feature = "arbitrary_precision")]
+        self.n.parse::<f64>().ok().filter(|float| float.is_finite())
+    }
+
+    /// Converts a finite `f64` to a `Number`. Infinite or NaN values are not JSON
+    /// numbers.
+    ///
+    /// ```
+    /// # use std::f64;
+    /// #
+    /// # use serde_json::Number;
+    /// #
+    /// assert!(Number::from_f64(256.0).is_some());
+    ///
+    /// assert!(Number::from_f64(f64::NAN).is_none());
+    /// ```
+    #[inline]
+    pub fn from_f64(f: f64) -> Option<Number> {
+        if f.is_finite() {
+            let n = {
+                #[cfg(not(feature = "arbitrary_precision"))]
+                {
+                    N::Float(f)
+                }
+                #[cfg(feature = "arbitrary_precision")]
+                {
+                    ryu::Buffer::new().format_finite(f).to_owned()
+                }
+            };
+            Some(Number { n })
+        } else {
+            None
+        }
+    }
+
+    /// Returns the exact original JSON representation that this Number was
+    /// parsed from.
+    ///
+    /// For numbers constructed not via parsing, such as by `From<i32>`, returns
+    /// the JSON representation that serde\_json would serialize for this
+    /// number.
+    ///
+    /// ```
+    /// # use serde_json::Number;
+    /// for value in [
+    ///     "7",
+    ///     "12.34",
+    ///     "34e-56789",
+    ///     "0.0123456789000000012345678900000001234567890000123456789",
+    ///     "343412345678910111213141516171819202122232425262728293034",
+    ///     "-343412345678910111213141516171819202122232425262728293031",
+    /// ] {
+    ///     let number: Number = serde_json::from_str(value).unwrap();
+    ///     assert_eq!(number.as_str(), value);
+    /// }
+    /// ```
+    #[cfg(feature = "arbitrary_precision")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "arbitrary_precision")))]
+    pub fn as_str(&self) -> &str {
+        &self.n
+    }
+
+    pub(crate) fn as_f32(&self) -> Option<f32> {
+        #[cfg(not(feature = "arbitrary_precision"))]
+        match self.n {
+            N::PosInt(n) => Some(n as f32),
+            N::NegInt(n) => Some(n as f32),
+            N::Float(n) => Some(n as f32),
+        }
+        #[cfg(feature = "arbitrary_precision")]
+        self.n.parse::<f32>().ok().filter(|float| float.is_finite())
+    }
+
+    pub(crate) fn from_f32(f: f32) -> Option<Number> {
+        if f.is_finite() {
+            let n = {
+                #[cfg(not(feature = "arbitrary_precision"))]
+                {
+                    N::Float(f as f64)
+                }
+                #[cfg(feature = "arbitrary_precision")]
+                {
+                    ryu::Buffer::new().format_finite(f).to_owned()
+                }
+            };
+            Some(Number { n })
+        } else {
+            None
+        }
+    }
+
+    #[cfg(feature = "arbitrary_precision")]
+    /// Not public API. Only tests use this.
+    #[doc(hidden)]
+    #[inline]
+    pub fn from_string_unchecked(n: String) -> Self {
+        Number { n }
+    }
+}
+
+impl Display for Number {
+    #[cfg(not(feature = "arbitrary_precision"))]
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        match self.n {
+            N::PosInt(u) => formatter.write_str(itoa::Buffer::new().format(u)),
+            N::NegInt(i) => formatter.write_str(itoa::Buffer::new().format(i)),
+            N::Float(f) => formatter.write_str(ryu::Buffer::new().format_finite(f)),
+        }
+    }
+
+    #[cfg(feature = "arbitrary_precision")]
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        Display::fmt(&self.n, formatter)
+    }
+}
+
+impl Debug for Number {
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        write!(formatter, "Number({})", self)
+    }
+}
+
+impl Serialize for Number {
+    #[cfg(not(feature = "arbitrary_precision"))]
+    #[inline]
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        match self.n {
+            N::PosInt(u) => serializer.serialize_u64(u),
+            N::NegInt(i) => serializer.serialize_i64(i),
+            N::Float(f) => serializer.serialize_f64(f),
+        }
+    }
+
+    #[cfg(feature = "arbitrary_precision")]
+    #[inline]
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        use serde::ser::SerializeStruct;
+
+        let mut s = tri!(serializer.serialize_struct(TOKEN, 1));
+        tri!(s.serialize_field(TOKEN, &self.n));
+        s.end()
+    }
+}
+
+impl<'de> Deserialize<'de> for Number {
+    #[inline]
+    fn deserialize<D>(deserializer: D) -> Result<Number, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        struct NumberVisitor;
+
+        impl<'de> Visitor<'de> for NumberVisitor {
+            type Value = Number;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                formatter.write_str("a JSON number")
+            }
+
+            #[inline]
+            fn visit_i64<E>(self, value: i64) -> Result<Number, E> {
+                Ok(value.into())
+            }
+
+            #[inline]
+            fn visit_u64<E>(self, value: u64) -> Result<Number, E> {
+                Ok(value.into())
+            }
+
+            #[inline]
+            fn visit_f64<E>(self, value: f64) -> Result<Number, E>
+            where
+                E: de::Error,
+            {
+                Number::from_f64(value).ok_or_else(|| de::Error::custom("not a JSON number"))
+            }
+
+            #[cfg(feature = "arbitrary_precision")]
+            #[inline]
+            fn visit_map<V>(self, mut visitor: V) -> Result<Number, V::Error>
+            where
+                V: de::MapAccess<'de>,
+            {
+                let value = tri!(visitor.next_key::<NumberKey>());
+                if value.is_none() {
+                    return Err(de::Error::invalid_type(Unexpected::Map, &self));
+                }
+                let v: NumberFromString = tri!(visitor.next_value());
+                Ok(v.value)
+            }
+        }
+
+        deserializer.deserialize_any(NumberVisitor)
+    }
+}
+
+#[cfg(feature = "arbitrary_precision")]
+struct NumberKey;
+
+#[cfg(feature = "arbitrary_precision")]
+impl<'de> de::Deserialize<'de> for NumberKey {
+    fn deserialize<D>(deserializer: D) -> Result<NumberKey, D::Error>
+    where
+        D: de::Deserializer<'de>,
+    {
+        struct FieldVisitor;
+
+        impl<'de> de::Visitor<'de> for FieldVisitor {
+            type Value = ();
+
+            fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                formatter.write_str("a valid number field")
+            }
+
+            fn visit_str<E>(self, s: &str) -> Result<(), E>
+            where
+                E: de::Error,
+            {
+                if s == TOKEN {
+                    Ok(())
+                } else {
+                    Err(de::Error::custom("expected field with custom name"))
+                }
+            }
+        }
+
+        tri!(deserializer.deserialize_identifier(FieldVisitor));
+        Ok(NumberKey)
+    }
+}
+
+#[cfg(feature = "arbitrary_precision")]
+pub struct NumberFromString {
+    pub value: Number,
+}
+
+#[cfg(feature = "arbitrary_precision")]
+impl<'de> de::Deserialize<'de> for NumberFromString {
+    fn deserialize<D>(deserializer: D) -> Result<NumberFromString, D::Error>
+    where
+        D: de::Deserializer<'de>,
+    {
+        struct Visitor;
+
+        impl<'de> de::Visitor<'de> for Visitor {
+            type Value = NumberFromString;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                formatter.write_str("string containing a number")
+            }
+
+            fn visit_str<E>(self, s: &str) -> Result<NumberFromString, E>
+            where
+                E: de::Error,
+            {
+                let n = tri!(s.parse().map_err(de::Error::custom));
+                Ok(NumberFromString { value: n })
+            }
+        }
+
+        deserializer.deserialize_str(Visitor)
+    }
+}
+
+#[cfg(feature = "arbitrary_precision")]
+fn invalid_number() -> Error {
+    Error::syntax(ErrorCode::InvalidNumber, 0, 0)
+}
+
+macro_rules! deserialize_any {
+    (@expand [$($num_string:tt)*]) => {
+        #[cfg(not(feature = "arbitrary_precision"))]
+        #[inline]
+        fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error>
+        where
+            V: Visitor<'de>,
+        {
+            match self.n {
+                N::PosInt(u) => visitor.visit_u64(u),
+                N::NegInt(i) => visitor.visit_i64(i),
+                N::Float(f) => visitor.visit_f64(f),
+            }
+        }
+
+        #[cfg(feature = "arbitrary_precision")]
+        #[inline]
+        fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error>
+            where V: Visitor<'de>
+        {
+            if let Some(u) = self.as_u64() {
+                return visitor.visit_u64(u);
+            } else if let Some(i) = self.as_i64() {
+                return visitor.visit_i64(i);
+            } else if let Some(f) = self.as_f64() {
+                if ryu::Buffer::new().format_finite(f) == self.n || f.to_string() == self.n {
+                    return visitor.visit_f64(f);
+                }
+            }
+
+            visitor.visit_map(NumberDeserializer {
+                number: Some(self.$($num_string)*),
+            })
+        }
+    };
+
+    (owned) => {
+        deserialize_any!(@expand [n]);
+    };
+
+    (ref) => {
+        deserialize_any!(@expand [n.clone()]);
+    };
+}
+
+macro_rules! deserialize_number {
+    ($deserialize:ident => $visit:ident) => {
+        #[cfg(not(feature = "arbitrary_precision"))]
+        fn $deserialize<V>(self, visitor: V) -> Result<V::Value, Error>
+        where
+            V: Visitor<'de>,
+        {
+            self.deserialize_any(visitor)
+        }
+
+        #[cfg(feature = "arbitrary_precision")]
+        fn $deserialize<V>(self, visitor: V) -> Result<V::Value, Error>
+        where
+            V: de::Visitor<'de>,
+        {
+            visitor.$visit(tri!(self.n.parse().map_err(|_| invalid_number())))
+        }
+    };
+}
+
+impl<'de> Deserializer<'de> for Number {
+    type Error = Error;
+
+    deserialize_any!(owned);
+
+    deserialize_number!(deserialize_i8 => visit_i8);
+    deserialize_number!(deserialize_i16 => visit_i16);
+    deserialize_number!(deserialize_i32 => visit_i32);
+    deserialize_number!(deserialize_i64 => visit_i64);
+    deserialize_number!(deserialize_i128 => visit_i128);
+    deserialize_number!(deserialize_u8 => visit_u8);
+    deserialize_number!(deserialize_u16 => visit_u16);
+    deserialize_number!(deserialize_u32 => visit_u32);
+    deserialize_number!(deserialize_u64 => visit_u64);
+    deserialize_number!(deserialize_u128 => visit_u128);
+    deserialize_number!(deserialize_f32 => visit_f32);
+    deserialize_number!(deserialize_f64 => visit_f64);
+
+    forward_to_deserialize_any! {
+        bool char str string bytes byte_buf option unit unit_struct
+        newtype_struct seq tuple tuple_struct map struct enum identifier
+        ignored_any
+    }
+}
+
+impl<'de, 'a> Deserializer<'de> for &'a Number {
+    type Error = Error;
+
+    deserialize_any!(ref);
+
+    deserialize_number!(deserialize_i8 => visit_i8);
+    deserialize_number!(deserialize_i16 => visit_i16);
+    deserialize_number!(deserialize_i32 => visit_i32);
+    deserialize_number!(deserialize_i64 => visit_i64);
+    deserialize_number!(deserialize_i128 => visit_i128);
+    deserialize_number!(deserialize_u8 => visit_u8);
+    deserialize_number!(deserialize_u16 => visit_u16);
+    deserialize_number!(deserialize_u32 => visit_u32);
+    deserialize_number!(deserialize_u64 => visit_u64);
+    deserialize_number!(deserialize_u128 => visit_u128);
+    deserialize_number!(deserialize_f32 => visit_f32);
+    deserialize_number!(deserialize_f64 => visit_f64);
+
+    forward_to_deserialize_any! {
+        bool char str string bytes byte_buf option unit unit_struct
+        newtype_struct seq tuple tuple_struct map struct enum identifier
+        ignored_any
+    }
+}
+
+#[cfg(feature = "arbitrary_precision")]
+pub(crate) struct NumberDeserializer {
+    pub number: Option<String>,
+}
+
+#[cfg(feature = "arbitrary_precision")]
+impl<'de> MapAccess<'de> for NumberDeserializer {
+    type Error = Error;
+
+    fn next_key_seed<K>(&mut self, seed: K) -> Result<Option<K::Value>, Error>
+    where
+        K: de::DeserializeSeed<'de>,
+    {
+        if self.number.is_none() {
+            return Ok(None);
+        }
+        seed.deserialize(NumberFieldDeserializer).map(Some)
+    }
+
+    fn next_value_seed<V>(&mut self, seed: V) -> Result<V::Value, Error>
+    where
+        V: de::DeserializeSeed<'de>,
+    {
+        seed.deserialize(self.number.take().unwrap().into_deserializer())
+    }
+}
+
+#[cfg(feature = "arbitrary_precision")]
+struct NumberFieldDeserializer;
+
+#[cfg(feature = "arbitrary_precision")]
+impl<'de> Deserializer<'de> for NumberFieldDeserializer {
+    type Error = Error;
+
+    fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        visitor.visit_borrowed_str(TOKEN)
+    }
+
+    forward_to_deserialize_any! {
+        bool u8 u16 u32 u64 u128 i8 i16 i32 i64 i128 f32 f64 char str string seq
+        bytes byte_buf map struct option unit newtype_struct ignored_any
+        unit_struct tuple_struct tuple enum identifier
+    }
+}
+
+impl From<ParserNumber> for Number {
+    fn from(value: ParserNumber) -> Self {
+        let n = match value {
+            ParserNumber::F64(f) => {
+                #[cfg(not(feature = "arbitrary_precision"))]
+                {
+                    N::Float(f)
+                }
+                #[cfg(feature = "arbitrary_precision")]
+                {
+                    f.to_string()
+                }
+            }
+            ParserNumber::U64(u) => {
+                #[cfg(not(feature = "arbitrary_precision"))]
+                {
+                    N::PosInt(u)
+                }
+                #[cfg(feature = "arbitrary_precision")]
+                {
+                    u.to_string()
+                }
+            }
+            ParserNumber::I64(i) => {
+                #[cfg(not(feature = "arbitrary_precision"))]
+                {
+                    N::NegInt(i)
+                }
+                #[cfg(feature = "arbitrary_precision")]
+                {
+                    i.to_string()
+                }
+            }
+            #[cfg(feature = "arbitrary_precision")]
+            ParserNumber::String(s) => s,
+        };
+        Number { n }
+    }
+}
+
+macro_rules! impl_from_unsigned {
+    (
+        $($ty:ty),*
+    ) => {
+        $(
+            impl From<$ty> for Number {
+                #[inline]
+                fn from(u: $ty) -> Self {
+                    let n = {
+                        #[cfg(not(feature = "arbitrary_precision"))]
+                        { N::PosInt(u as u64) }
+                        #[cfg(feature = "arbitrary_precision")]
+                        {
+                            itoa::Buffer::new().format(u).to_owned()
+                        }
+                    };
+                    Number { n }
+                }
+            }
+        )*
+    };
+}
+
+macro_rules! impl_from_signed {
+    (
+        $($ty:ty),*
+    ) => {
+        $(
+            impl From<$ty> for Number {
+                #[inline]
+                fn from(i: $ty) -> Self {
+                    let n = {
+                        #[cfg(not(feature = "arbitrary_precision"))]
+                        {
+                            if i < 0 {
+                                N::NegInt(i as i64)
+                            } else {
+                                N::PosInt(i as u64)
+                            }
+                        }
+                        #[cfg(feature = "arbitrary_precision")]
+                        {
+                            itoa::Buffer::new().format(i).to_owned()
+                        }
+                    };
+                    Number { n }
+                }
+            }
+        )*
+    };
+}
+
+impl_from_unsigned!(u8, u16, u32, u64, usize);
+impl_from_signed!(i8, i16, i32, i64, isize);
+
+#[cfg(feature = "arbitrary_precision")]
+impl_from_unsigned!(u128);
+#[cfg(feature = "arbitrary_precision")]
+impl_from_signed!(i128);
+
+impl Number {
+    #[cfg(not(feature = "arbitrary_precision"))]
+    #[cold]
+    pub(crate) fn unexpected(&self) -> Unexpected {
+        match self.n {
+            N::PosInt(u) => Unexpected::Unsigned(u),
+            N::NegInt(i) => Unexpected::Signed(i),
+            N::Float(f) => Unexpected::Float(f),
+        }
+    }
+
+    #[cfg(feature = "arbitrary_precision")]
+    #[cold]
+    pub(crate) fn unexpected(&self) -> Unexpected {
+        Unexpected::Other("number")
+    }
+}