We'd love to accept your patches and contributions to this project. There are just a few small guidelines you need to follow.
Contributions to this project must be accompanied by a Contributor License Agreement. You (or your employer) retain the copyright to your contribution, this simply gives us permission to use and redistribute your contributions as part of the project. Head over to https://cla.developers.google.com/ to see your current agreements on file or to sign a new one.
You generally only need to submit a CLA once, so if you've already submitted one (even if it was for a different project), you probably don't need to do it again.
All submissions, including submissions by project members, require review. We use GitHub pull requests for this purpose. Consult GitHub Help for more information on using pull requests.
Although this project is just licensed under the Apache License v2.0, the CLA is sufficient to allow Google the option to relicense in the future under a dual Apache2/MIT license. e.g. if this project were merged into another project that was dual licensed.
Please feel free to email David Lattimore (email address in Cargo.toml) if you'd like you contribute but aren't sure how, or if you have some ideas and want guidance, etc.