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    Variable apiKeyProblemConst

    apiKeyProblem: Problem<string>

    An API key must be a header value: no control character (C0, DEL, C1) and nothing above Latin-1, which Node refuses in a header (a bidi mark among them). Without this the request fails locally, after its retries, as an "Unexpected error". Blank is nonBlankProblem's. The key is never quoted in the reason.