Kotools Types 5.2.0 drops string-based storage for faster Integer arithmetic

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Kotools Types 5.2.0 overhauls its experimental Integer type by replacing internal string-based value storage with native arbitrary-precision integer representations. Previously, every arithmetic operation required re-parsing a string representation of the number and re-serializing the result, making performance degrade as numbers grew larger. The updated implementation delegates to platform-native types — java.lang.BigInteger on JVM, JavaScript's BigInt, and a custom sign-magnitude implementation on Native — so parsing and formatting occur only at input and output boundaries. This change eliminates unnecessary overhead for multi-step arithmetic on large integers and also removes the library's sole third-party runtime dependency on Kotlin/Native. The Integer type remains annotated as experimental and is expected to be stabilized in a future release.

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