What about this? Would this satisfy the metaprogramming problem? ```js
Object.getOwnPropertyNames(obj)
.map(name => [name, obj[name]])
.filter(keepCorrectFunctions)
.map(([name, f]) => {
obj mixin {
[name + 'Async'](...args) {
return new Promise((resolve, reject) =>
f.call(this, ...args, (err, ...rest) =>
err == null ?
resolve(rest) :
reject(err)));
}
}
});
```
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