[Bug Report] VTextField emits change-event even when value has not changed

[tony19]

Versions and Environment

Vuetify: 1.2.3
Vue: 2.5.17
Browsers: Chrome 68
OS: macOS High Sierra

Steps to reproduce

1. Create v-text-field
2. Put cursor in text input
3. Press ENTER multiple times (without changing text input value)

Expected Behavior

change-event emitted only if there's a change in the text input's value.

Actual Behavior

change-event emitted for every ENTER-keypress even when the value has not changed

Reproduction Link

https://codepen.io/morphatic/pen/ExVKoRx?editors=1111

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Additional Comments:

This appears to be a bug caused by 47c73e6#diff-c2cbb2f11cf8c97e6eff0981f9927269R353

For reference, here's a demo of the change-event in a native <input>: https://codepen.io/tony19/pen/JapOod?editors=1001

[morphatic]

The repro was out of date. Still a bug. Here's a new "working" link: https://codepen.io/morphatic/pen/ExVKoRx