Why is the headers attribute of InternalAxiosRequestConfig mandatory?

[yangwwwping]

Describe the issue

The headers attribute in AxiosRequestConfig is optional, and InternalAxiosRequestConfig inherits from AxiosRequestConfig, but its headers attribute is required.

The InternalAxiosRequestConfig interface is inherited when encapsulating axios, but its headers attribute is required, resulting in new AxiosHeaders() being assigned to it every time it is used.

Why is it designed?

Example Code

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Expected behavior

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Axios Version

1.3.4

Adapter Version

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Browser

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Browser Version

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Node.js Version

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OS

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Additional Library Versions

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Additional context/Screenshots

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