RSpec 3.11.0+ distinguish between hashes and Ruby 3 keywords

[voxik]

This is due to change in RSpec [1], which cuases issues such as:

  1) MultiJson default options sets both load and dump options
     Failure/Error: self.load_options = self.dump_options = value

       MultiJson received :dump_options= with unexpected arguments
         expected: ({:foo=>"bar"})
              got: ({:foo=>"bar"})
     # ./lib/multi_json.rb:15:in `default_options='
     # ./spec/multi_json_spec.rb:171:in `block (4 levels) in <top (required)>'
     # /builddir/build/BUILD/spec/spec_helper.rb:12:in `silence_warnings'
     # ./spec/multi_json_spec.rb:171:in `block (3 levels) in <top (required)>'

Fixes #203

[djberg96]

@mbleigh @joshk @sferik or @rwz are y'all still maintaining this gem? Any chance we could incorporate these changes, as well as #202?

[sferik]

Thanks for the ping. I just merged this and #202. 😊