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* Make dependency on `image` optional After PR https://github.com/shssoichiro/oxipng/pull/481 was merged, the `image` dependency became unused when building with debug assertions disabled, as it is only used to implement output sanity checks when such assertions are enabled. The `image` crate transitively pulls a significant amount of dependencies, so it's useful for OxiPNG users to get rid of them when not needed. [Cargo does not allow specifying dependencies that are only pulled when debug assertions are enabled](https://github.com/rust-lang/cargo/issues/7634), so the next best way to give users some flexibility is to gate those debug assertions behind a feature flag. These changes add a `sanity-checks` feature flag that controls whether the `image` crate and the related sanity checks are compiled in. This feature is enabled by default to keep debug builds useful to catch problems during development. * Fix Clippy lints * Run tests with new sanity-checks feature enabled |
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