[ruby-talk:444695] [ANN] cel 0.4.0 released

[Tiago Cardoso via ruby-talk]

cel 0.4.0 has been released.

cel is a pure Ruby implementation of Google Common Expression Language, https://opensource.google/projects/cel.

The Common Expression Language (CEL) implements common semantics for expression evaluation, enabling different applications to more easily interoperate.

```ruby
require "cel"

# set the environment
env = Cel::Environment.new(name: :string, group: :string)

# parse
ast = env.compile('name.startsWith("/groups/" + group)')

# check
prg = env.program(ast)
# evaluate
prg.evaluate(name: Cel::String.new("/groups/acme.co/documents/secret-stuff"),
    group: Cel::String.new("acme.co")) #=> true

# or do it all in one go

env.evaluate('name.startsWith("/groups/" + group)',
  name: Cel::String.new("/groups/acme.co/documents/secret-stuff"),
  group: Cel::String.new("acme.co")
)

```

Here are the updates since the last release:

## [0.4.0] - 2025-11-18

### Features

`cel-ruby` supports the defined set of [CEL extensions](https://github.com/google/cel-go/blob/master/ext/README.md): math, string, bind and encoders.

```ruby
Cel::Environment.new.evaluate("math.bitShiftLeft(1, 2) ") #=> returns 4
```

### Improvements

When the `tzinfo-data` gem is loaded, expressions will support human-friendly timezones, such as "US/Central", for timestamps.

## [0.3.1] - 2025-08-01

### Improvements

* Support for depth protection, using the defaults from the spec (ex: recursion depth of 32, nesting depth of 32), and supporting API to override them (ex: `Cel::Environment.new(max_recursion_depth: 42))`).
* lazy-evaluating bindings to avoid upfront costly transformations of ruby objects into cel objects which are ultimately not used in expressions.

### Bugfixes

* `has()` macro correctly works for maps.