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npm install --production installs devDependency, which leads to error in npm ls --production

What I Wanted to Do

I want to install a package which has a dependency on licensezero-postinstall.
licensezero-postinstall has a devDependency on the standard library, and a
dependency on wordwrap. I expect that when I run npm install --production,
the dependency wordwrap will be installed, and standard will not be installed.

I also expect that running npm ls --production will not show any extraneous

This is important because, for example, vsce uses npm ls --production
command to build packages for the visual studio code marketplace, and expects
npm ls to not have any extraneous dependencies.

Finally, npm prune --production does not remove the standard library.

What Happened Instead

standard will be installed, and npm ls will show standard as an
extraneous dependency.

Reproduction Steps

git clone`
cd test2
npm install --production
npm ls --production

Shows extraneous dependency:

test2@1.0.0 /Users/jbeard4/tmp/test2
└─┬ licensezero-postinstall@1.0.0
  ├── standard@11.0.1 extraneous
  └── word-wrap@1.2.3

npm ERR! extraneous: standard@11.0.1 /Users/jbeard4/tmp/test2/node_modules/licensezero-postinstall/node_modules/standard


Platform Info

$ npm --versions
{ test2: '1.0.0',
  npm: '6.4.1',
  ares: '1.10.1-DEV',
  cldr: '32.0',
  http_parser: '2.8.0',
  icu: '60.1',
  modules: '57',
  napi: '3',
  nghttp2: '1.32.0',
  node: '8.12.0',
  openssl: '1.0.2p',
  tz: '2017c',
  unicode: '10.0',
  uv: '1.19.2',
  v8: '6.2.414.66',
  zlib: '1.2.11' }
$ node -p process.platform