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Did you read the code? It is standard functionality, but only in newer Node versions and browsers. The linked package is basically a polyfill.

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It is now, but it wasn't standard functionality back when this library was first published.

first commit is from 2013 [0], first Node that had Array.isArray was 0.1.15 from 2009 [1], thus making is as Node module was pointless, but polyfill for browsers might have some sense.

- [0] https://github.com/juliangruber/isarray/commit/c8601522e3136...

- [1] https://github.com/nodejs/node-v0.x-archive/blob/v0.1.15/Cha...

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