cel 0.6.0 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: ## [0.6.0] - 2026-02-28 ### Features #### Network Extension Support the network extension, as defined [here]( https://pkg.go.dev/k8s.io/apiserver/pkg/cel/library#IP). ### Improvements #### support top-level lookup (ex: '.y') also, make sure than, on lookup, keys under the passed container take priority, except in the case where the lookup is top-level (i.e. '.y'). at the same time, #merge is refactored in order to: * normalize nested bindings into aggregated keys ({a:{b:1}} => {:"a.b"=> 1} * override container-prefixed variables with the local binding * deal with conflicts by moving them to top level.