pub fn own_enum_string_keys(v: &Value) -> Result<Vec<String>, String>Expand description
The own keys of a proxy that are ENUMERABLE string keys — Object.keys,
for-in’s own half, object spread and JSON.stringify all need this shape.
10.5.11 defines it as ownKeys filtered by each key’s [[GetOwnProperty]],
so both traps really do run, in that order.