[array-type] ReadonlyArray is regarded as Array

[koooge]

Hi there,
ReadonlyArray is regarded as Array in array-type rule. Similarly, readonly T[] is regarded to be the same as T[].

• I have tried restarting my IDE and the issue persists.
• I have updated to the latest version of the packages.
• I have read the FAQ and my problem is not listed.

Repro

Here is an example of 'array'.

{
  "rules": {
    '@typescript-eslint/array-type': ['error', {
      default: 'array',
      readonly: 'array', // 'array' | 'generic' | 'array-simple'
    }],
  }
}

const foo: ReadonlyArray<string> = [];

Expected Result

4:12  error  Array type using 'ReadonlyArray<string>' is forbidden. Use 'readonly string[]' instead  @typescript-eslint/array-type

Actual Result

4:12  error  Array type using 'Array<string>' is forbidden. Use 'string[]' instead  @typescript-eslint/array-type

Additional Info
#4066

Versions

package	version
@typescript-eslint/eslint-plugin	5.2.0
@typescript-eslint/parser	5.2.0
TypeScript	4.4.4
ESLint	8.1.0
node	16.13.0

[JoshuaKGoldberg]

Ah that does make sense, thanks!