Prevent the app from freezing when the index prop supplied is of type string

[igordanchenko]

Discussed in #213

^{Originally posted by jgudo December 1, 2023}
It is clearly stated in docs that the index prop only accepts number type. However, there are instance where the index pass comes from html data attributes like this example codesandbox.

If you would change the line from onClickImage method line 25, setActiveIndex(+idx || 0);, into setActiveIndex(idx || 0); removing the unary + operator or unparsing the string, the app would freeze or become unresponsive.
It would be better if we can throw an error if the index is of type string to prevent the app from freezing.

[github-actions]

🎉 This issue has been resolved in version 3.15.6 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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