serde_json_borrow 0.9.0

Provides JSON deserialization into a borrowed DOM
Documentation 
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use std::borrow::Cow;
use std::ops::Deref;

use serde::Deserialize;

/// A wrapper around `Cow<str>` that implements `Deserialize` and can deserialize
/// string keys into Cow::Borrowed when possible.
///
/// This is because serde always deserializes strings into `Cow::Owned`.
/// https://github.com/serde-rs/serde/issues/1852#issuecomment-559517427
#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Deserialize)]
pub struct CowStr<'a>(#[serde(borrow)] pub Cow<'a, str>);

impl Deref for CowStr<'_> {
    type Target = str;

    fn deref(&self) -> &Self::Target {
        &self.0
    }
}

impl PartialEq<&str> for CowStr<'_> {
    fn eq(&self, other: &&str) -> bool {
        self.0 == *other
    }
}

impl<'a> From<&'a str> for CowStr<'a> {
    fn from(s: &'a str) -> Self {
        Self(Cow::Borrowed(s))
    }
}

impl<'a> From<CowStr<'a>> for Cow<'a, str> {
    fn from(s: CowStr<'a>) -> Self {
        s.0
    }
}