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0b08bba0c7
Previously we always used `Function('return this')` but this triggers
CSP errors since it's basically `eval`. Instead this adds a few
preflight checks to look for objects like `globalThis`, `self`, etc.
Currently we don't have a `#[wasm_bindgen]` function annotation to
import a bare global field like `self`, but we test accesses with
`self.self` and `globalThis.globalThis`, catching errors to handle any
issues.
Closes #1641