JSON5 is not supported by STJ

[kzu]

Description

See https://json5.org

Reproduction Steps

Try to parse the kitchen sink example from json5.org:

{
  // comments
  unquoted: 'and you can quote me on that',
  singleQuotes: 'I can use "double quotes" here',
  lineBreaks: "Look, Mom! \
No \\n's!",
  hexadecimal: 0xdecaf,
  leadingDecimalPoint: .8675309, andTrailing: 8675309.,
  positiveSign: +1,
  trailingComma: 'in objects', andIn: ['arrays',],
  "backwardsCompatible": "with JSON",
}

Expected behavior

Parses fine.

Actual behavior

Fails

Regression?

No

Known Workarounds

No response

Configuration

No response

Other information

No response