Error when using specific adapter on first calls

[cbliard]

Environment

Using multi_json version 1.15.0 on ruby 3.1.2

Issue

When calling load or dump with a specific adapter on first call, it fails with a NoMethodError: undefined method 'key?' for nil:NilClass error:

[1] pry(main)> MultiJson.dump({abc: "def"}, adapter: :json_gem)
NoMethodError: undefined method `key?' for nil:NilClass

      cache.key?(key) ? cache[key] : write(cache, key, &block)
           ^^^^^
from /home/cbliard/.asdf/installs/ruby/3.1.2/lib/ruby/gems/3.1.0/gems/multi_json-1.15.0/lib/multi_json/options_cache.rb:12:in `fetch'
[2] pry(main)> MultiJson.load('{"abc": "def"}', adapter: :json_gem)
NoMethodError: undefined method `key?' for nil:NilClass

      cache.key?(key) ? cache[key] : write(cache, key, &block)
           ^^^^^
from /home/cbliard/.asdf/installs/ruby/3.1.2/lib/ruby/gems/3.1.0/gems/multi_json-1.15.0/lib/multi_json/options_cache.rb:12:in `fetch'

If calling it without the adapter parameter, then with it, it works:

[1] pry(main)> MultiJson.load('{"abc": "def"}')
=> {"abc"=>"def"}
[2] pry(main)> MultiJson.load('{"abc": "def"}', adapter: :json_gem)
=> {"abc"=>"def"}
[3] pry(main)> MultiJson.dump({abc: "def"}, adapter: :json_gem)
=> "{\"abc\":\"def\"}"

The error occurs because the cache MultiJson::OptionsCache is somehow not initialized yet when calling load with an adapter parameter.

Workaround

Calling MultiJson::OptionsCache.reset before anything else can make it work.

[1] pry(main)> MultiJson.load('{"abc": "def"}', adapter: :json_gem)
NoMethodError: undefined method `key?' for nil:NilClass

      cache.key?(key) ? cache[key] : write(cache, key, &block)
           ^^^^^
from /home/cbliard/.asdf/installs/ruby/3.1.2/lib/ruby/gems/3.1.0/gems/multi_json-1.15.0/lib/multi_json/options_cache.rb:12:in `fetch'
[2] pry(main)> MultiJson::OptionsCache.reset
=> {}
[3] pry(main)> MultiJson.load('{"abc": "def"}', adapter: :json_gem)
=> {"abc"=>"def"}

[djberg96]

Can confirm, this happens with multi_json 1.15.0 with ruby 3.1.3 on my Mac. I tried it with "oj".