Event string type
This event is dispatched when a new mapping is created.
This event is dispatched when a mapping is destroyed.
This event is dispatched if an existing mapping is overridden without first unMapping it.
The reason for dispatching an event (and tracing a warning) is that in most cases, overriding existing mappings is a sign of bugs in the application. Deliberate mapping changes should be done by first removing the existing mapping.
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Data shipped along with event notification, if any