Using an array as an object key

Consider this block:

https://github.com/minimistjs/minimist/blob/62fde7d935f83417fb046741531a9e2346a36976/index.js#L52-L66

Here it builds an array of aliased args:
https://github.com/minimistjs/minimist/blob/62fde7d935f83417fb046741531a9e2346a36976/index.js#L55-L57

And here it uses this array as a key for strings:
https://github.com/minimistjs/minimist/blob/62fde7d935f83417fb046741531a9e2346a36976/index.js#L64

Which will just result in:
```js
{
  strings: {
    "[object Object]": true
  }
}
```

It should either build flat aliases or iterate over the nested array


	Object.keys(opts.alias \|\| {}).forEach(function (key) {
	aliases[key] = [].concat(opts.alias[key]);
	aliases[key].forEach(function (x) {
	aliases[x] = [key].concat(aliases[key].filter(function (y) {
	return x !== y;
	}));
	});
	});

	[].concat(opts.string).filter(Boolean).forEach(function (key) {
	flags.strings[key] = true;
	if (aliases[key]) {
	flags.strings[aliases[key]] = true;
	}
	});

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Using an array as an object key #9

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