Deserialization for RangeFrom and RangeTo doesn't work

[emilbonnek]

It seems that the deserialization for RangeFrom and RangeTo has been switched around such that RangeTo expects a "start" and RangeFrom expects a "end". They are correct in the serialization though.

See the following test:

#[cfg(test)]
mod tests {
    use std::ops::{Range, RangeFrom, RangeTo};

    use serde_json;

    #[test]
    fn deserialize_range_to() {
        let json = r#"{"end": 173}"#;
        let result: Result<RangeTo<u32>, serde_json::Error> = serde_json::from_str(json);
        assert!(result.is_ok(), "Deserialization failed: {:?}", result); // Fails
    }

    #[test]
    fn deserialize_range_from() {
        let json = r#"{"start": 173}"#;
        let result: Result<RangeFrom<u32>, serde_json::Error> = serde_json::from_str(json);
        assert!(result.is_ok(), "Deserialization failed: {:?}", result); // Fails
    }

    #[test]
    fn deserialize_range() {
        let json = r#"{"start": 173, "end": 176}"#;
        let result: Result<Range<u32>, serde_json::Error> = serde_json::from_str(json);
        assert!(result.is_ok(), "Deserialization failed: {:?}", result); // Passes
    }
}

It seems to have been introduced in #2471.