#1 Implement _check

[natainakata]

Hello, We have implemented exports._check().

Description

The type checking process implemented in the four arithmetic functions has been moved to _check().

Testing

Since _check() was implemented, describe.skip() was changed to describe() and the test was run.
The test passed.

[dantharejabot]

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Thank you for the submission, @natainakata! I'll review your code shortly, hang tight.

[dantharejabot]

LGTM 👍

Thanks for your contribution @natainakata!

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Your code style completely follows the style guide. Nice job!

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All the tests are passing. Nice job!

[dantharejabot]

🎉 You did it! 🎉

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