nuxt-content build error when class prop is an object

[olibia]

Version

@nuxt/content: v1.4.1
nuxt: v2.13.3

Steps to reproduce

Add an object as class property to nuxt-content component.

<nuxt-content :class="{ myClass: true }">

Run yarn build && yarn export.

What is Expected?

The project to build successfully and the component to be displayed.

What is actually happening?

Build error when mode is universal.

TypeError: (data.class || []).concat is not a function
    at render (.nuxt/content/nuxt-content.js:127:0)
    at /home/olibia/Projects/Statica/baba-au-rum/node_modules/vue/dist/vue.runtime.common.prod.js:6:22507
    at Ie (/home/olibia/Projects/Statica/baba-au-rum/node_modules/vue/dist/vue.runtime.common.prod.js:6:22689)
    at /home/olibia/Projects/Statica/baba-au-rum/node_modules/vue/dist/vue.runtime.common.prod.js:6:23819
    at Le (/home/olibia/Projects/Statica/baba-au-rum/node_modules/vue/dist/vue.runtime.common.prod.js:6:24170)
    at e._c (/home/olibia/Projects/Statica/baba-au-rum/node_modules/vue/dist/vue.runtime.common.prod.js:6:32380)
    at a.render (pages/posts/_id.vue?7336:1:0)
    at a.t._render (/home/olibia/Projects/Statica/baba-au-rum/node_modules/vue/dist/vue.runtime.common.prod.js:6:35273)
    at /home/olibia/Projects/Statica/baba-au-rum/node_modules/vue-server-renderer/build.prod.js:1:70665
    at runNextTicks (internal/process/task_queues.js:62:5)
    at listOnTimeout (internal/timers.js:518:9)
    at processTimers (internal/timers.js:492:7)

Client error when mode is spa.

TypeError: (intermediate value).concat is not a function

Notes

This does not happen on development.

The error occurs because of this line:

content/lib/templates/nuxt-content.js

Line 127 in c5a11fc

data.class = (data.class || []).concat('nuxt-content')

It expects classes to be an Array.