rspec testsuite fails with ruby4.0.0dev 2025-11-24

[mtasaka]

Beginning with this ruby4.0.0dev commit:
ruby/ruby@c7a84ae

(Or for ruby/json: beginning with this commit:
ruby/json@4f4551f
)

jmespath git head ( 5e86ea7 )
rspec testsuite fails like:

An error occurred while loading ./spec/compliance_spec.rb.
Failure/Error:
          describe("Given #{scenario['given'].to_json}") do
            scenario['cases'].each do |test_case|
              if test_case['error']
  
                it "the expression #{test_case['expression'].inspect} raises a #{test_case['error']} error" do
                  error_class = case test_case['error']
                                when 'runtime' then JMESPath::Errors::RuntimeError
                                when 'syntax' then JMESPath::Errors::SyntaxError
                                when 'invalid-type' then JMESPath::Errors::InvalidTypeError
                                when 'invalid-value' then JMESPath::Errors::InvalidValueError

JSON::GeneratorError:
  source sequence is illegal/malformed utf-8
# ./spec/compliance_spec.rb:12:in 'JSON::Ext::Generator::GeneratorMethods::Hash#to_json'
# ./spec/compliance_spec.rb:12:in 'block (4 levels) in <top (required)>'
# ./spec/compliance_spec.rb:11:in 'Array#each'
# ./spec/compliance_spec.rb:11:in 'block (3 levels) in <top (required)>'
# ./spec/compliance_spec.rb:10:in 'block (2 levels) in <top (required)>'
# ./spec/compliance_spec.rb:5:in 'Array#each'
# ./spec/compliance_spec.rb:5:in 'block in <top (required)>'
# ./spec/compliance_spec.rb:4:in '<top (required)>'

An error occurred while loading ./spec/implicit_conversion_spec.rb.
Failure/Error:
              describe("Given #{scenario['given'].to_json}") do
                scenario['cases'].each do |test_case|
                  next if test_case['error']
                  it "searching #{test_case['expression'].inspect} returns #{test_case['result'].to_json}" do
                    result = JMESPath.search(test_case['expression'], Wrapper.wrap(scenario['given']))
  
                    expect(JMESPath::Util.as_json(result)).to eq(test_case['result'])
                  end
                end
              end

JSON::GeneratorError:
  source sequence is illegal/malformed utf-8
# ./spec/implicit_conversion_spec.rb:65:in 'JSON::Ext::Generator::GeneratorMethods::Hash#to_json'
# ./spec/implicit_conversion_spec.rb:65:in 'block (5 levels) in <module:JMESPath>'
# ./spec/implicit_conversion_spec.rb:64:in 'Array#each'
# ./spec/implicit_conversion_spec.rb:64:in 'block (4 levels) in <module:JMESPath>'
# ./spec/implicit_conversion_spec.rb:63:in 'block (3 levels) in <module:JMESPath>'
# ./spec/implicit_conversion_spec.rb:58:in 'Array#each'
# ./spec/implicit_conversion_spec.rb:58:in 'block (2 levels) in <module:JMESPath>'
# ./spec/implicit_conversion_spec.rb:57:in 'block in <module:JMESPath>'
# ./spec/implicit_conversion_spec.rb:37:in '<module:JMESPath>'
# ./spec/implicit_conversion_spec.rb:36:in '<top (required)>'


Finished in 0.00007 seconds (files took 0.5614 seconds to load)
0 examples, 0 failures, 2 errors occurred outside of examples

spec/compliance/identifiers.json is failing (if I remove this json file, rspec testsuite passes).