Trylle

High-Level Changes

Enhanced JSON Interoperability: New support for JSON names across the checker, AST, and runtime allows for more seamless data handling when working with JSON-native structures.
Improved Developer Tooling: Integration is now smoother thanks to new utilities for converting Go errors into cel.Issues and more descriptive, context-aware error messages.
Greater Environment Flexibility: You can now redeclare variables as constants and export parse limit options, providing finer control over how CEL environments are configured and constrained.
Native Struct Improvements: Support for mixing CEL and native values within native structs simplifies the handling of complex, hybrid data types.

Add helper method to check whether a function has a singleton binding in https://github.com/google/cel-go/pull/1266
Helper utility for converting a Go error into cel.Issues in https://github.com/google/cel-go/pull/1267
Policy API improvements in https://github.com/google/cel-go/pull/1268
CEL Test usability requirements in https://github.com/google/cel-go/pull/1269
Better context-related error messages in https://github.com/google/cel-go/pull/1271
Sort env.Config values where reasonable in https://github.com/google/cel-go/pull/1273
Support redeclaring variables as constants in NewEnv in https://github.com/google/cel-go/pull/1275
Add support for exporting parse limit options in https://github.com/google/cel-go/pull/1277
Support mixing CEL values and native values in native structs in https://github.com/google/cel-go/pull/1270
Add checker, AST, and type-provider support for JSON names in https://github.com/google/cel-go/pull/1283
JSON field names runtime support in https://github.com/google/cel-go/pull/1286
Optionally include reachable fieldpaths in prompt in https://github.com/google/cel-go/pull/1285
REPL -- cel-spec pb2 and json name support https://github.com/google/cel-go/pull/1294

Fix support for config-based type references in https://github.com/google/cel-go/pull/1265
Check arg kinds in optional.or and .orValue impl in https://github.com/google/cel-go/pull/1276
Bazel fixes for import in https://github.com/google/cel-go/pull/1278
Support zero-value literals in presence test inlining https://github.com/google/cel-go/pull/1280
Cache concatList.Size() to prevent O(N^2) evaluation time https://github.com/google/cel-go/pull/1291
Preserve runtime error node IDs from Resolve https://github.com/google/cel-go/pull/1290
Default enable identifier escaping with backticks https://github.com/google/cel-go/pull/1295
Cap format string precision to prevent memory exhaustion https://github.com/google/cel-go/pull/1292

chore: Migrate gsutil usage to gcloud storage in https://github.com/google/cel-go/pull/1274
Lint fixes for exported function/type comments in https://github.com/google/cel-go/pull/1279
Lint fixes for import in https://github.com/google/cel-go/pull/1287

Full Changelog: https://github.com/google/cel-go/compare/v0.27.0...v0.28.0-alpha