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    // This is a private module that contains `PartialEq` and `From` trait
    // implementations for `JsonValue`.

    use std::collections::{BTreeMap, HashMap};

    use crate::short::{self, Short};
    use crate::number::Number;
    use crate::object::Object;
    use crate::value::JsonValue;

    macro_rules! implement_eq {
        ($to:ident, $from:ty) => {
            impl PartialEq<$from> for JsonValue {
                fn eq(&self, other: &$from) -> bool {
                    match *self {
                        JsonValue::$to(ref value) => value == other,
                        _                         => false
                    }
                }
            }

            impl<'a> PartialEq<$from> for &'a JsonValue {
                fn eq(&self, other: &$from) -> bool {
                    match **self {
                        JsonValue::$to(ref value) => value == other,
                        _                         => false
                    }
                }
            }

            impl PartialEq<JsonValue> for $from {
                fn eq(&self, other: &JsonValue) -> bool {
                    match *other {
                        JsonValue::$to(ref value) => value == self,
                        _ => false
                    }
                }
            }
        }
    }

    macro_rules! implement {
        ($to:ident, $from:ty as num) => {
            impl From<$from> for JsonValue {
                fn from(val: $from) -> JsonValue {
                    JsonValue::$to(val.into())
                }
            }

            implement_eq!($to, $from);
        };
        ($to:ident, $from:ty) => {
            impl From<$from> for JsonValue {
                fn from(val: $from) -> JsonValue {
                    JsonValue::$to(val)
                }
            }

            implement_eq!($to, $from);
        }
    }

    impl<'a> From<&'a str> for JsonValue {
        fn from(val: &'a str) -> JsonValue {
            if val.len() <= short::MAX_LEN {
                JsonValue::Short(unsafe { Short::from_slice(val) })
            } else {
                JsonValue::String(val.into())
            }
        }
    }

    impl<T: Into<JsonValue>> From<Option<T>> for JsonValue {
        fn from(val: Option<T>) -> JsonValue {
            match val {
                Some(val) => val.into(),
                None      => JsonValue::Null,
            }
        }
    }

    impl<T: Into<JsonValue>> From<Vec<T>> for JsonValue {
        fn from(val: Vec<T>) -> JsonValue {
            JsonValue::Array(val.into_iter().map(Into::into).collect())
        }
    }

    impl<'a, T: Into<JsonValue> + Clone> From<&'a [T]> for JsonValue {
        fn from(val: &'a [T]) -> JsonValue {
            JsonValue::Array(val.iter().cloned().map(Into::into).collect())
        }
    }

    impl<K: AsRef<str>, V: Into<JsonValue>> From<HashMap<K, V>> for JsonValue {
        fn from(val: HashMap<K, V>) -> JsonValue {
            JsonValue::Object(val.into_iter().collect())
        }
    }

    impl<K: AsRef<str>, V: Into<JsonValue>> From<BTreeMap<K, V>> for JsonValue {
        fn from(val: BTreeMap<K, V>) -> JsonValue {
            JsonValue::Object(val.into_iter().collect())
        }
    }

    impl<'a> PartialEq<&'a str> for JsonValue {
        fn eq(&self, other: &&str) -> bool {
            match *self {
                JsonValue::Short(ref value)  => value == *other,
                JsonValue::String(ref value) => value == *other,
                _ => false
            }
        }
    }

    impl<'a> PartialEq<JsonValue> for &'a str {
        fn eq(&self, other: &JsonValue) -> bool {
            match *other {
                JsonValue::Short(ref value)  => value == *self,
                JsonValue::String(ref value) => value == *self,
                _ => false
            }
        }
    }

    impl PartialEq<str> for JsonValue {
        fn eq(&self, other: &str) -> bool {
            match *self {
                JsonValue::Short(ref value)  => value == other,
                JsonValue::String(ref value) => value == other,
                _ => false
            }
        }
    }

    impl<'a> PartialEq<JsonValue> for str {
        fn eq(&self, other: &JsonValue) -> bool {
            match *other {
                JsonValue::Short(ref value)  => value == self,
                JsonValue::String(ref value) => value == self,
                _ => false
            }
        }
    }

    implement!(String, String);
    implement!(Number, isize as num);
    implement!(Number, usize as num);
    implement!(Number, i8 as num);
    implement!(Number, i16 as num);
    implement!(Number, i32 as num);
    implement!(Number, i64 as num);
    implement!(Number, u8 as num);
    implement!(Number, u16 as num);
    implement!(Number, u32 as num);
    implement!(Number, u64 as num);
    implement!(Number, f32 as num);
    implement!(Number, f64 as num);
    implement!(Number, Number);
    implement!(Object, Object);
    implement!(Boolean, bool);