Bug: Callback bug that prevent's build on iOS

[ronickg]

Repro of https://github.com/mrousavy/nitro/issues/975.

Tried to make the sample as simple as possible. If one comments out the self.callback = callback the build will work again, or if one switches out the ArrayBuffer with a string type it works as well. More complex types like custom types or ArrayBuffers seem to have issues.

[vercel[bot]]

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