This release focusses on bug fixes and stability improvements.
There is one language change, and that is to allow the $ character in identifiers. The main reasons for this is that it is a commonly used character in identifiers in JSON. The single $ is currently reserved.
Changelog
6f9c049 Add YAML support to export command
503fecd Decode null as NULL token in yaml decoder
c4f74cc Revert "cue: fix lookup for cue API"
8a043dc Use baseValue from source in binOp to make gc working
4dc023b Use cache during walk
170697a cmd/cue/cmd: also make field optional if it is a pointer
d372ba8 cmd/cue/cmd: convert package block comments in cue get go
d100ae6 cmd/cue/cmd: small help command fixes
a9fdbe7 cmd/cue/cmd: track use of indexing op for dependencies
f16c065 cue/format: improve indentation of in comprehensions
8e72f0b cue/load: cleanup and made code more defensive
ff96e8d cue/parser: improve error message for misused keywords
8a2df96 cue/scanner: allow $ as a letter in identifiers
b3cde9d cue: Reference handles concrete values for index operations
3a2e63b cue: always check for errors before calling builtin functions
630935e cue: detect errors in struct when comparing to bottom
afdbec3 cue: disallow references to string labels (per spec)
5c2d937 cue: don't turn of manifesting in normalization
324cc0f cue: don't validate optional fields
279ca6a cue: fix bug related to non-structural direct self-references
13628f1 cue: fix compilation bug using $foo identifiers
3d0b204 cue: fix crash on alias use in lists
40d2667 cue: fix exporting of label aliases
c937e7a cue: fix lookup
353ede2 cue: fix lookup for cue API
8bd2426 cue: fix lookup for cue API
52b04d4 cue: fix optional handling in subsumption
6cd62ea cue: ignore optional fields for Equals
5a0a3f2 cue: no quotes needed for identifiers with $
d256a2c cue: prevent regression to bug in older version
030b9b7 cue: remove uses of log.Panicf
d7d2837 describe the go get step before cue get go in the tutorial
c8d6c39 doc/ref/spec.md: clarify newline behavior for multiline strings
c6e5d17 doc/ref/spec.md: fix typo
4d29dde doc/ref/spec.md: simplify attributes
0e038f6 doc/tutorial/kubernetes: update to latest
3960473 doc/tutorial/kubernetes: update to use new syntax consistently
8f9ef31 doc/tutorial/kubernetes: update to v1 versions
815dca2 doc/tutorial: fixing bad link in string literals
80ffe27 doc/tutorial: removing duplicate word in bounds
5b4fa8b doc: fix typos in language spec
085ce9c fix typos in docs
31cd2b7 internal/diff: first stab add diffing functionality
5cb6ffe internal/yaml: import null value properly
7fdff9c pkg/math/bits: complete operations
7334a13 pkg/math: use higher precision implementations
6ffe55d tools/trim: fix spurious removal of top-level declarations
cba0372 tools/trim: move trim logic to package