Select with v-model triggers change event when its options are changed

[floorish]

Version

2.4.2

Reproduction link

https://jsfiddle.net/floorish/e2h2vwc2/

Steps to reproduce

Dynamically change the <option>s in a <select v-model="val"> tag and the v-model triggers a change event, but the actually chosen option hasn't changed.

What is expected?

v-model does not trigger a change event

What is actually happening?

v-model triggers a change event

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Change of behaviour intruduced in c90b140

[jkzing]

Looks like a regression

[posva]

The event is triggering at the beginning as well while it shouldn't