trailingComma: none is ignored by v4+

[sbreakey]

Environments:

• Prettier Version: 4.1.1 (but any 4+ version is reproducible)
• Running Prettier via: VS Code
• Runtime: No idea. VS Code?
• Operating System: Windows 10

Steps to reproduce:

set the rule "prettier.trailingComma": "none" in your settings. Write some typescript like:

x = {
  'a': 'b'
}

Expected behavior:
Given the no trailing commas, the above block of code should not be formatted

Actual behavior:
The setting is ignored and the code is formatted to:

x = {
  'a': 'b',
}

thereby creating a mess in git diffs.

NOTE: downgrading to version 3.20.0 fixes the issue for whatever reason.
EDIT: this appears to affect other rules too, e.g. whatever the rule is that wraps single arguments to arrow functions is (I think arrowParens)?

[fisker]

Please use playground to report issue, otherwise this will be closed.

[sbreakey]

Please use playground to report issue, otherwise this will be closed.

Sorry, I don't know what that is. And it isn't immediately obvious how to setup a trivial example there.
In my particular case I've downgraded and that fixes it for me. if you don't want to fix the issue, then you can close it.

[sbreakey]

Looks like this belongs in https://github.com/prettier/prettier-vscode anyway