The "json" filter not support to use "0" as parameter

[fengyuanchen]

Vue.js version

1.0.24

Reproduction Link

Steps to reproduce

new Vue({
  data: {
    person: {
      name: 'Felix',
    },
  },
});

<pre>{{ person | json 0 }}</pre>

What is Expected?

{"name":"Felix"}

What is actually happening?

{
  "name": "Felix"
}

[posva]

FYI 0 indent level should lead to: wrong code

Fixing it, thanks for reporting it 😄