axiosInstance doesn't inherit default headers from apisauce

[smitroshin]

Description

In some specific cases I need to do a request using axiosInstance.
And I'm expecting axiosInstance to have the same configuration as apisauce instance.
Unfortunately, headers from axiosInstance doesn't have the same default values specified in apisauce instance headers.

Issue

import { create } from "apisauce";

const apisauceInstance = create({
  headers: {
    "X-Custom-Prop": "customProp",
  },
});

console.log(apisauceInstance.headers["X-Custom-Prop"]);
// "customProp"

console.log(apisauceInstance.axiosInstance.defaults.headers.common["X-Custom-Prop"]);
// undefined

Example on CodeSandbox

Expecting

apisauceInstance.axiosInstance.defaults.headers.common to be the same as apisauceInstance.headers.

My workaround

apisauceInstance.axiosInstance.post("http://some-post-endpoint", undefined, {
  headers: {
    ...apisauceInstance.headers,
    "X-Another-Custom-Prop": "anotherCustomProp",
  },
});

Package version

apisauce@3.0.1