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Instead of
```hbs
{{on "input" (action this.foo value="target.value")}}
{{on "input" (action (mut this.bar) value="target.value")}}
```
you can use:
```hbs
{{on "input" (with-event-value this.foo)}}
{{on "input" (with-event-value (fn (mut this.bar)))}}
```
or in gjs:
```gjs
import { fn } from "@ember/helper";
import { on } from "@ember/modifier";
import withEventValue from "discourse/helpers/with-event-value";
…
{{on "input" (withEventValue (fn (mut this.bar)))}}
```
