vue-loader strip out html comments in <template> section?

[cnweibo]

Under dev environment, i'd like to keep the comments information in both and <style> and <script> section in .vue file.
Unfortunately, it seems that all the comments(html,js,css) are stripped out in webpack dev environment.
How can i disable that?
For example, in following del-container.vue file, i add html comments within the root div of the component, when inspecting in chrome dev tool, that comment
<!-- del-container -->
is not available

<template>
    <div :class=" containerClass ">
        <!-- del-container -->
        <slot></slot>
        <span class="m-del-container__close" @click="deleteIt"><span >x</span></span>
    </div>
</template>

[zigomir]

@cnweibo Please report at https://github.com/vuejs/vue-loader