optify 1.3.0

Simplifies getting the right configuration options for a process using pre-loaded configurations from files (JSON, YAML, etc.) to manage options for experiments or flights. This library is mainly made to support building implementations for other languages such as Node.js, Python, and Ruby. It is not meant to be consumed directly yet.
Documentation 
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/// Merges objects recursively with a target for the right information and defaults to use if the target is missing a value.
/// The `target` is the final value after many merges.
/// `defaults` has values to use if the `target` is missing a value.
/// I.e., values in `target` override values in `defaults`.
/// If a key is missing from `target`, it is copied from `defaults`.
/// If the key is present in both `target` and `defaults` and the value is an object, the objects are merged recursively.
#[inline]
pub fn merge_json_with_defaults(target: &mut serde_json::Value, defaults: &serde_json::Value) {
    match (target, defaults) {
        (serde_json::Value::Object(target_map), serde_json::Value::Object(defaults_map)) => {
            for (key, defaults_value) in defaults_map {
                match target_map.get_mut(key) {
                    Some(target_value) => {
                        // They both have a value for this key.
                        merge_json_with_defaults(target_value, defaults_value);
                    }
                    None => {
                        // Default value is missing from target.
                        target_map.insert(key.clone(), defaults_value.clone());
                    }
                }
            }
        }
        _ => {
            // Either:
            // defaults is not an object, but target is already defined so use the target.
            // target is not an object, so use it as is.
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use serde_json::json;

    #[test]
    fn test_merge_with_defaults() {
        let mut target = json!({"a": 1, "b": 2});
        let defaults = json!({"b": 3, "c": 4});
        merge_json_with_defaults(&mut target, &defaults);
        assert_eq!(target, json!({"a": 1, "b": 2, "c": 4}));
    }

    #[test]
    fn test_merge_with_defaults_nested() {
        let mut target = json!({
            "level1": {
                "a": 1,
                "b": 2
            }
        });
        let defaults = json!({
            "level1": {
                "b": 3,
                "c": 4
            }
        });
        merge_json_with_defaults(&mut target, &defaults);
        assert_eq!(
            target,
            json!({
                "level1": {
                    "a": 1,
                    "b": 2,
                    "c": 4
                }
            })
        );
    }

    #[test]
    fn test_merge_with_defaults_deeply_nested() {
        let mut target = json!({
            "l1": {
                "l2": {
                    "l3": {
                        "a": 1
                    }
                }
            }
        });
        let defaults = json!({
            "l1": {
                "l2": {
                    "l3": {
                        "a": 57,
                        "b": 2
                    },
                    "new": "value"
                }
            }
        });
        merge_json_with_defaults(&mut target, &defaults);
        assert_eq!(
            target,
            json!({
                "l1": {
                    "l2": {
                        "l3": {
                            "a": 1,
                            "b": 2
                        },
                        "new": "value"
                    }
                }
            })
        );
    }

    #[test]
    fn test_merge_with_defaults_type_override() {
        let mut target = json!({"key": {"nested": 1}});
        let defaults = json!({"key": "string"});
        merge_json_with_defaults(&mut target, &defaults);
        assert_eq!(target, json!({"key": {"nested": 1}}));
    }

    #[test]
    fn test_merge_with_defaults_missing_key() {
        let mut target = json!({"a": 1});
        let defaults = json!({"b": 2});
        merge_json_with_defaults(&mut target, &defaults);
        assert_eq!(target, json!({"a": 1, "b": 2}));
    }

    #[test]
    fn test_merge_with_defaults_arrays_not_merged() {
        let mut target = json!({"arr": [1, 2, 3]});
        let defaults = json!({"arr": [4, 5]});
        merge_json_with_defaults(&mut target, &defaults);
        // Target array is preserved, not replaced or merged.
        assert_eq!(target, json!({"arr": [1, 2, 3]}));
    }
}