Throw TypeError on read failure

Editor assessment

Hard to fault. 'throw TypeError on read failure' names the exact error type and the exact condition, the ext/fetch scope is precise, and the whole header fits easily within limits — ideal for one-line git log scanning and changelog generation. The imperative, lowercase, no-period conventions are all respected. No body, and none is strictly needed because the subject is self-contained; a purist might ask whether callers relied on the previous behavior, but for a small behavioral correction that is a PR-discussion detail. This is what a well-formed fix commit looks like: short, specific, correctly typed.