Having a component that emits a kebab-cased event (e.g. new-value as in Quasar's QSelect), you see the following warning:

Component emitted event "new-value" but it is neither declared in the emits option nor as an "onNew-value" prop.

The component actually defined a prop named onNewValue - without extra-listing new-event in it's emits property.

It looks like this is due to the toHandlerKey helper only capitalizes the event name - which then only converts the first character to UPPERCASE.

Conventions done't allow non-camelized properties - so I think the toHandlerKey actually needs to capitalize(camelize(str))

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