preserves 5.0.0-rc.9

Implementation of the Preserves serialization format.
Documentation 
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use crate::{IOValue, Symbol};

impl<T: AsRef<str> + Clone + std::fmt::Debug> serde::Serialize for Symbol<T> {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> where S: serde::Serializer {
        IOValue::symbol(self.inner().as_ref().to_string()).serialize(serializer)
    }
}

impl<'de> serde::Deserialize<'de> for Symbol<String> {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> where D: serde::Deserializer<'de> {
        let v = IOValue::deserialize(deserializer)?;
        let s = v.value().as_symbol().ok_or_else(|| serde::de::Error::custom("Expected symbol"))?;
        Ok(Symbol::new(s.into_owned()))
    }
}

pub fn serialize<S>(s: &str, serializer: S) -> Result<S::Ok, S::Error> where S: serde::Serializer {
    use serde::Serialize;
    Symbol::new(s).serialize(serializer)
}

pub fn deserialize<'de, D>(deserializer: D) ->
    Result<String, D::Error> where D: serde::Deserializer<'de>
{
    use serde::Deserialize;
    Symbol::deserialize(deserializer).map(|v| v.inner().to_owned())
}