minify.format.ascii_only results in invalid escape sequences

[mischnic]

Describe the bug

Sometimes ascii_only results in invalid escape sequences.

Input code

function p(µ, σ) {}
console.log(p);

Config

{
  "jsc": {
    "parser": {
      "syntax": "ecmascript",
      "jsx": false
    },
    "target": "es5",
    "loose": false,
    "minify": {
      "compress": false,
      "mangle": false,
      "format": {
        "ascii_only": true
      }
    },
  },
  "module": {
    "type": "es6"
  },
  "minify": false,
  "isModule": true
}

Playground link (or link to the minimal reproduction)

https://play.swc.rs/?version=1.3.94-nightly-20231016.1&code=H4sIAAAAAAAAA0srzUsuyczPUyjQOLRVR%2BF8s6ZCdS1Xcn5ecX5Oql5OfrpGgaY1AJi68IYlAAAA&config=H4sIAAAAAAAAA2WPSw7DIAxE9z1F5HW37aJ36BkqizoRET%2FZRGoU5e4FAkmqbhC8GY%2BH5dJ1MIqCR7eka3oEZCHe34nI7CJ%2BEgFSFkWxDhGuTR0lSz0aoYLWTYGIPFAsU3KrdjDeCzV7ZVY73c%2FnhcrbwCTya8xWdIOhP9x7thhPCYmlnlq%2FvDM5OfJEVVqPkuUA699Tyaz%2Fj3OgrfUdDlPruC8GLc82WeLXLxV2OoFLAQAA

SWC Info output

No response

Expected behavior

Output valid JS

Actual behavior

function p(\xb5, \u03C3) {}
console.log(p);

Version

1.3.94-nightly-20231016.1

Additional context

parcel-bundler/parcel#9370

[swc-bot]

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