vue go error when bind model with: v-model="obj['prefix'+i+'suffix']"

[ije]

vue go error when bind model with: v-model="obj['prefix'+i+'suffix']", but it's ok when v-model="obj['prefix'+i]"

<p v-for="i in 3">
  <!-- the `editingContent.meta` is a vaild child object of vue instance -->
  <input v-model="editingContent.meta['prefix'+i]"> <!-- ok -->
  <input v-model="editingContent.meta[('prefix'+i)+'suffix']"> <!-- ok -->
  <input v-model="editingContent.meta['prefix'+i+'suffix']"> <!-- error -->
</p>

console print:

with vue 1.10