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Add note about is_int portability. #14

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Add note about is_int portability. #14

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2 changes: 1 addition & 1 deletion README.md
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Expand Up @@ -912,7 +912,7 @@ $ true
```

## Check if a number is an integer

Note: This does not work in `zsh`, or `zsh` invoked as `sh`, as `printf %d` called with a string in zsh simply prints 0 rather than erroring.
**Example Function:**

```sh
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