Identifier with \u{xxxx} doesn't make validation

Steps to reproduce

es.parse('a\\u{0022}b=1')

Expected output

pares error

Actual output

{
    "type": "Program",
    "body": [
        {
            "type": "ExpressionStatement",
            "expression": {
                "type": "AssignmentExpression",
                "operator": "=",
                "left": {
                    "type": "Identifier",
                    "name": "a\"b"
                },
                "right": {
                    "type": "Literal",
                    "value": 1,
                    "raw": "1"
                }
            }
        }
    ],
    "sourceType": "script"
}

Problem location

scanner.ts:462(getComplexIdentifier)
scanner.ts:490(getComplexIdentifier)

Relevant references

Start in scanner.ts at getComplexIdentifier around lines 462 and 490, then reproduce the issue with es.parse('a\u{0022}b=1'). The work is done when this invalid identifier produces a parse error instead of an AST containing the decoded name a"b.