Evaluator
Fix a panic which could occur when using the error built-in with cyclic references.
Fix a panic which could occur when loading @experiment(aliasv2) syntax with an invalid alias name.
cmd/cue
Relax the cue login --token validation to allow future Central Registry token types.
Encodings
Fix a bug in the TOML decoder where nested arrays were causing incorrect "duplicate key" errors.
Full list of changes since v0.15.3