# New and Improved Rust CDK: First-class support for Rust Canister Development

**URL:** <https://forum.dfinity.org/t/new-and-improved-rust-cdk-first-class-support-for-rust-canister-development/10399>\
**Category:** Developers\
**Created:** [January 20, 2022, 9:10pm UTC](https://forum.dfinity.org/t/new-and-improved-rust-cdk-first-class-support-for-rust-canister-development/10399 "2022-01-20T21:10:29Z")\
**Posts on this page:** 1\
**Showing post:** 37

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**Author:** ![roman-kashitsyn](https://sea1.discourse-cdn.com/flex023/user_avatar/forum.dfinity.org/roman-kashitsyn/32/3802_2.png) [@roman-kashitsyn](https://forum.dfinity.org/u/roman-kashitsyn)\
**Post date:** [April 13, 2022, 4:01pm UTC](https://forum.dfinity.org/t/new-and-improved-rust-cdk-first-class-support-for-rust-canister-development/10399/37 "2022-04-13T16:01:38Z")

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It depends on whether you care about build reproducibility. The replica exposes the SHA256 hash of the compressed module (it stores exactly the bytes that you’ve sent), and compression is not deterministic in general. I would not want automatic compression by DFX for canisters I work on: we use a custom build procedure anyways; we could just as well add a compression step there (1 extra line).

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