isJSONSerializable bug

[magion33]

Environment

Any environment, any version. Present from the start it seems like.

Reproduction

Running isJSONSerializable(null) serves sufficiently as a reproduction of the bug.

Describe the bug

This line has a bug.

ofetch/src/utils.ts

Line 22 in dfbe3ca

if (t === "string" || t === "number" || t === "boolean" || t === null) {

Firstly, t (typeof value) will never triple equal null. (dead code)
Secondly, null as a value is JSON serializable. This util function will not identify it as such.
Thirdly, if you provide null to this util function, it will throw:

Uncaught TypeError: Cannot read properties of null (reading 'buffer')
    at isJSONSerializable

Additional context

Can I create a PR fix?

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