This release comprises a number of bug fixes and small improvements, as well as more ground work for Modules, WebAssembly, and the core evaluator's performance refactors.
Note that v0.7 was originally planned to center around the core evaluator's performance improvements. Since those refactors are not ready, and we have other fixes and improvements we want to release, we have slightly altered the release plan accordingly. We will share more details on our next community call.
As a reminder: users can register their projects with Unity, our regression and performance testing setup. Unity is used to ensure that a project's CUE evaluations do not unexpectedly stop working, or regress in terms of performance. Unity continues to catch multiple issues with each release. Adding your project to Unity not only guarantees that we will not break your tests (if we do, we will work with you to fix your CUE code), but it also helps to improve the quality of each CUE release. Follow this link to learn more about Unity, install it, or get in touch with any questions.
Thank you to @SteVwonder, @bozaro, @cedricgc, @howardjohn, @mpvl, @mvdan, @myitcv, @nickfiggins, @rogpeppe, @rudifa, and @uhthomas for contributing to this release!
And a special thanks to all who joined the recent contributor office hours calls on our community calendar, as well as our #contributing channel on Slack! Thanks to their involvement, more issues can be investigated and fixed each release.
Go API
Note that this version of CUE requires Go 1.20 or later, per our policy to support the latest two stable Go releases just like upstream.
CL 1172105 fixes a regression introduced in v0.6.0 where calling Iterator.Selector.Index while iterating over a list would incorrectly panic.
CL 1167597 fixes cue/load so it now errors on package import cycles, following the spec.
CL 1167647 adjusts cue.Value.Decode to decode empty CUE lists into a Go interface{} as a non-nil empty slice.
CL 547369 teaches cue.Value.Decode how to decode values which aren't entirely concrete into a Go type by using cue.Value as part of the destination type.
Language
There are no changes to the language in this version.
Spec
CL 1171216 fixes two errors in a dynamic fields example.
Core Evaluator
CL 1172014 disallows the direct use of unary operators with basic types, since they would result in confusing bounds which seemed incorrect.
CL 1172013 fixes a closedness bug where close did not properly apply when used inside definitions.
CL 1172874 fixes a panic in cue export introduced by v0.6.0.
Encoders
CL 1172314 teaches encoding/protobuf to follow the field_behavior annotation marking a field as either optional or required when decoding.
Builtins
CL 1172991 adds a mustSucceed boolean parameter to tool/exec.Run, which can be set to false to allow a command to fail and set its own field success to false.
CL 557322 fixes the values of math's Log2E and Log10E constants, which were being incorrectly truncated.
cmd/cue
CLs 1170966 and 1171302 fix a number of issues in cue fmt (and by extension the cue/format package), resulting in better and more consistent formatting of CUE files.
CLs 1171292, 1171015, 1170115, and 1171971 implement a variety of improvements and bug fixes for cue get go.
CL 1172017 fixes a number of issues with the line and column positions reported by our YAML decoder, which could result in weird CUE formatting when using cue import or misleading positions being shown to the user.
CL 1169709 increases the robustness of cue export -o, which in some situations could ignore file errors or incorrectly replace an existing file without the -f flag.
CL 1173072 fixes a panic when using cue import --list with empty YAML input.
CL 1168436 updates the cue export documentation to add the missing cue and binary supported export formats.
Modules
A number of changes are included to support an experimental implementation of the proposed modules and package management support. These aren't enabled by default, and will be announced soon.
Full list of changes since v0.6.0
go test -race by @mvdan in cbdd996