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The `page_size` crate is a simple libc wrapper for Unix and uses `winapi-rs` for Windows. `windows-sys` and `windows-rs` are the modern alternatives for the unmaintained `winapi-rs`. Both crates are maintained by Microsoft - they're official. Getting the page size is a simple call for both Unix and Windows. Besides Unix and Windows, I also added the page size for wasm32 which the `page_size` crate did not support. `wasm32`'s page size is a constant that is defined by the spec, so I hard coded it without adding additional dependencies. Finally, I dropped `maplit` which is seven years old and only used in one place. Calling `collect()` with a single item iterator is idiomatic as well as better in this case because Rust can optimize it. `maplit` called `HashMap::insert` which over allocates to amortize future allocs.