Struct Change 

pub struct Change {
    pub path: Arc<str>,
    pub old_value: OwnedDataValue,
    pub new_value: OwnedDataValue,
    pub removed: bool,
}

A single recorded mutation in the audit trail.

old_value and new_value are owned OwnedDataValues rather than Arc<OwnedDataValue> — eliminates one heap allocation per Change on the hot path. External consumers that need to share a Change across threads can wrap it themselves; in-process pipelines (audit-on map mappings) don’t pay the Arc cost they were never going to use.

A path that was absent before the write records old_value as null.

Fields

path: Arc<str>

old_value: OwnedDataValue

new_value: OwnedDataValue

The value written. null when Self::removed is set — read that flag rather than this value to tell a removal from a write.

removed: bool

The key at path was removed rather than written — a map mapping with unset, or on_null: "unset" meeting a null result. new_value is then null, which alone could not tell “now absent” from “now holds null”.

Skipped when false, so every write’s audit JSON is byte-identical to what it was before removals existed, and a reader that predates the field still loads a removal (as a write of null).

Trait Implementations

impl Clone for Change

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Change

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Change

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for Change

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.