lerna --scope does not support comma separated package names

Calling lerna add external-package-name --scope=internal-package-1,intenal-package-2 throws error

lerna notice cli v3.8.4
lerna info filter [ 'internal-package-1,internal-package-2 ]
lerna ERR! EFILTER No packages remain after filtering [ 'internal-package-1,internal-package-2' ]

Expected Behavior

Lerna should split the string after --scope= by a comma , and iterate resulting array.

Current Behavior

Here is a dump of stdout when trying to issue command line with multiple package names:

Tryout 1, resulting error

$ lerna add react --exact --scope=components,frontend-admin,frontend-public
info cli using local version of lerna
lerna notice cli v3.8.4
lerna info filter [ 'components,frontend-admin,frontend-public' ]
lerna ERR! EFILTER No packages remain after filtering [ 'components,frontend-admin,frontend-public' ]
✘-1 ~/workspace/s24 [master|●1✚ 5…2] 

Tryout 2, resulting error

$ lerna add react --exact --scope components,frontend-admin,frontend-public
info cli using local version of lerna
lerna notice cli v3.8.4
lerna info filter [ 'components,frontend-admin,frontend-public' ]
lerna ERR! EFILTER No packages remain after filtering [ 'components,frontend-admin,frontend-public' ]
✘-1 ~/workspace/s24 [master|●1✚ 5…2] 

Tryout 3, resulting success

$ lerna add react --exact --scope=components --scope=frontend-admin --scope=frontend-public
info cli using local version of lerna
lerna notice cli v3.8.4
lerna info filter [ 'components', 'frontend-admin', 'frontend-public' ]
lerna info Adding react in 3 packages
lerna info filter [ 'components', 'frontend-admin', 'frontend-public' ]
lerna info bootstrap root only
yarn install v1.12.3
[1/4] Resolving packages...
[2/4] Fetching packages...
[3/4] Linking dependencies...
[4/4] Building fresh packages...
success Saved lockfile.
Done in 3.13s.

Possible Solution

If package name contains comma ,, split it.

{
  "packages": [
    "packages/*"
  ],
  "version": "0.0.0",
  "npmClient": "yarn",
  "useWorkspaces": true
}

Context

I would like to add package to multiple packages without writing to much.

Your Environment