Use #hash to generate internal Hash map keys
Improve Array#hash implementation

Still not foolproof tho.
Explicitly set nil’s object_id

Now’s different from the id of NilClass.
Reimplement Hash#merge in terms of clone+merge
Use more advanced Kernel & Numeric #hash functions
Cleanup rake mspec_node task
Use my rubyspec fork until it’s merged
Allow passing an external pattern to mspec_node
Compare using #eql? during #hash clashes in #key?
Handle recursive values and keys in Hash#inspect
Mark the non compliant parts in rubyspecs
Use BasicObject#hash For Hash#hash
Ensure the $$id is generated via __id__
Normalize Numeric#hash

String#hash is still in the old format and risking collisions but will 
stick with it for now.
Add missing require
Cleanup var names and alignment
Use #hash for Hash.new with native JS object too
Use opal/rubyspec as the corelib specs gitmodule
Merge pull request #628 from opal/hash-hash

Use #hash to build Hash hash-tables #️⃣