fix using endless ranges for values parameter.

[dhruvCW]

allows using endless range for values validator.

e.g.

params do
  requires :minimum, type: Integer, values: 10..
  optional :maximum, type: Integer, values: ..10 
end

[dblock]

Perfect thank you.

[dblock]

I missed a failure here in CI because I was trained not to see it in all the edge failures :(

rspec ./spec/grape/validations/validators/values_spec.rb:390 # Grape::Validations::Validators::ValuesValidator does not allow an invalid value for a parameter using an endless range
rspec ./spec/grape/validations/validators/values_spec.rb:384 # Grape::Validations::Validators::ValuesValidator validates against values in an endless range

I disabled it for ActiveSupport < 6 in #2325, but please do PR a fix if you know of one.

[dhruvCW]

I disabled it for ActiveSupport < 6 in #2325, but please do PR a fix if you know of one.

thanks for patching the tests. The issue is because of a bug in rails 5.2 which was fixed in rails 6 but not backported.

rails/rails#36460

given rails 5.2 has already reached end of life a while back I don't think it's worth the effort to try and work around this problem.