PECL Ds\Map numeric string key warnings are incorrect

[tminich]

From manual page: https://php.net/ds-map.get and https://php.net/ds-map.set

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Both pages read

Caution
Be careful when using array syntax. Scalar keys will be coerced to integers by the engine.
For example, $map["1"] will attempt to access int(1), while $map->get("1") will correctly look up the string key.

See [Arrays](https://www.php.net/manual/en/language.types.array.php).

This is incorrect (probably outdated), Ds\Map preserves and expects numeric string keys as string no matter how you access them.