delete a?.b does not take effect

[chemwolf6922]

[chemwolf6922]

test code

let a = {b:true};
delete a?.b;
console.log(JSON.stringify(a));

outputs:

{"b":true}

Run this code with node, and the output will be:

{}

[chemwolf6922]

The use case for this will be

delete a.b?.c;

where a.b may not exist.

[mstepin]

This should definitely be fixed. Optional chaining, as part of ECMA2020, must also work for 'delete'.

[bellard]

fixed