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Previous my fix was reverted (See 0a8aec2 ).
And on master, the AR::Base is already loaded durring initialization.
To resolve original issues and AR::Base loading problem, I added 3 commits.
First: I added a testcase for original issue.
Second: I changed the timing of AR::Base loading (some tests weren't success).
Third: I fixed original issues.
/cc @josevalim