hx-on throws an error when used with event names that contain dots

[xhaggi]

Unlike hx-trigger, hx-on does not support event names that contain dots.

<div hx-get="/test" hx-trigger="my.custom.event" hx-on="my.custom.event: alert('Fired!')"></div>

Instead htmx throws a SyntaxError:

Uncaught SyntaxError: Unexpected token ':'