fs: recursive option is incompatible with encoding

[ChALkeR]

Found while looking at #60559

Both options are documented, and it's not mentioned that they can't be combined

> fs.readdirSync('.', { recursive: true, encoding: 'buffer' })
Uncaught:
TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received an instance of Buffer
    at Object.join (node:path:1339:7)
    at handleFilePaths (node:fs:1421:35)
    at processReaddirResult (node:fs:1400:92)
    at read (node:fs:1460:5)
    at readdirSyncRecursive (node:fs:1468:5)
    at Object.readdirSync (node:fs:1542:12) {
  code: 'ERR_INVALID_ARG_TYPE'
}
> await fs.promises.readdir('.', { recursive: true, encoding: 'buffer' })
Uncaught:
TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received an instance of Buffer
    at Object.join (node:path:1339:7)
    at readdirRecursive (node:internal/fs/promises:920:39)
    at async REPL3:1:33 {
  code: 'ERR_INVALID_ARG_TYPE'
}

[bakkot]

I think this is #58892?

See also #59202, #58634, #58869

[ChALkeR]

Yes, this seems to have the same cause, that list of issues is helpful, thanks!
They have different observed effect though, and technically one could be resolved without another
I think we should keep all of those open (unless there are direct duplicates) for now to track them