Merging doesn't appear to be symmetrical

[jchive]

Using this in a component with a keypress event,

<input text="text" on-keypress={this.keypress} v-model={this.d} />

works correctly and the keypress event is called and the model is bound

however

<input text="text" v-model={this.d} on-keypress={this.keypress} />

causes

Uncaught TypeError: Cannot read property 'apply' of undefined
at eval (index.js?9ef6:52)
at HTMLInputElement.invoker (vue.esm.js?efeb:1821)

Error

which I traced to a.apply(this.arguments) in

function mergeFn (a, b) {
  return function () {
    a.apply(this, arguments)  
    b.apply(this, arguments)
  }
}

So there is implication that the order of the attribute declarations is causing a difference of outcome in the mergeJSXProps function, where I would expect the outcome from the function would be the same?

(The v-model attribute is being supplied by the "babel-plugin-jsx-v-model" plugin).

[jchive]

On further inspection this may be down to the interaction with the babel-plugin-jsx-v-model plugin.