Update doc/builders/fetchers.chapter.md
Co-authored-by: Robert Hensing <roberth@users.noreply.github.com>
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## Caveats
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## Caveats
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Fetchers create [_fixed output derivations_](https://nixos.org/manual/nix/stable/#fixed-output-drvs) from downloaded files. Later, Nix can reuse the downloaded files via their hash. While the caching improves performance, it can lead to some confusion. For example, consider the following fetcher:
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Fetchers create [_fixed output derivations_](https://nixos.org/manual/nix/stable/#fixed-output-drvs) that downloaded files. Later, Nix can reuse the downloaded files via their hash. While the caching improves performance, it can lead to some confusion. For example, consider the following fetcher:
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```nix
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```nix
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fetchurl {
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fetchurl {
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