Additional properties are not allowed ('go-channel' was unexpected)

Here’s my snapcraft.yaml :

name: permaweb-host
version: git
summary: Throws a Git repo to IPNS
description: |
  Permaweb Host exposes a web interface and an API to add Git repos to IPNS.
  This interface is not protected. Ideally, if you want to sell its services,
  you should create your own web interface with user authentication and a payment gateway.
base: core18
confinement: strict
  - "386"
  - amd64
  - arm
  - arm64
      - git
      - gcc
      - go/stable
      - ipfs/edge
      - node/12/stable
    override-build: |
      npm install --global hogan.js
      npx hulk ./web/mustache/*.html --outputdir ./web/templates/
      go get -u
      ~/go/bin/rice embed-go
      snapcraftctl build
    source: .
    source-type: git
#    stage-snaps:
#      - ipfs/edge
#      - ipfs-cluster/edge
    plugin: go
    go-channel: stable

Now, can we all agree that in the go-plugin, there’s a go-channel, it’s a string, it refers to a channel, and that snap info go does contain stable?

What’s the problem?