Status of #= v-slot shorthand for default slot

[andreww2012]

Recently I learned that Vue supports even shorter syntax of v-slot directive for default slot: simply # instead of #default (playground):

<template>
  <Comp #="{foo}">{{ foo }}</Comp>
  <Comp>
    <template #="{foo}">{{ foo }}</template>
  </Comp>
</template>

However, I have not found any official information about this feature, so I would like to know what its status is. Thank you.

[andreww2012]

Wow, it looks like := and @= shorthands for v-bind=" and v-on=" respectively are also supported. It would be awesome to see them documented too 🙂