v0.21.0

go-ipld-prime's release policy says that:

even numbers should be easy upgrades; odd numbers may change things

This release is an odd number, and it does change some minor things.

🛠 Breaking

• Build: The minimum version of Go has been bumped from 1.18 to 1.19.
• Dependencies: The go-cid dependency was upgraded from v0.3.2 to v0.4.1. This is a relatively minor change but the introduction of ErrInvalidCid wrapping may be breaking for some users.
• Selectors: Remove hard error when a traversal encounters a slice matcher with a node that is not a string or bytes, by @rvagg #529

🔦 Features

• Traversal: Preloader functionality, by @hannahhoward and @rvagg #452
  • See the traversal package documentation for more information on how a Preloader can be used to introduce parallelism into a traversal. The Lassie project is currently using this functionality to speed up Bitswap block fetching; future releases of go-ipld-prime may include additional functionality being prototyped in Lassie to manage parallelism and caching.
• Schemas: Support listpairs struct representation in DSL parsing, by @rvagg #514
• Schemas: Support inline union representation in DSL parsing, by @rvagg #527
• Bindnode: Support listpairs struct representation, by @rvagg #514
• Selectors: Support negative values for slice matcher's From and To, by @rvagg #530
  • The slice matcher is currently being used to support byte-range fetching for the IPFS Trustless Gateway specification. Work is ongoing and can be seen in both the Lassie and Frisbii projects.
  • Please note that this feature is currently considered experimental and shoule be used with care and with the expectation that it may change in the near future. Expect a release or two before this feature is considered stable.

🩹 Fixes

• Traversal: StartAtPath work properly for matching walks, by @rvagg #500
• Traversal: WalkTransforming() work properly, by @EdSchouten #516
• Basicnode: basic.NewInt() returns a pointer like other constructors, by @hacdias #525
• Selectors: Cache offsets for sequential reads in slice matcher, by @rvagg #529

🌟 Thanks!

Thanks to @hacdias and @EdSchouten for their first contributions to go-ipld-prime!