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Expect Fixnum to be the class of #hash values
Mark some Hash#key specs as non compliant on Opal
In Opal Symbol = String and Fixnum = Float
Opal’s Array#hash implementation is not compliant
Yes, it’s probably too much an implementation detail.
Typo: $LOAD_FEATURES → $LOADED_FEATURES
Mark some String specs as not supported on Opal
Avoid string mutation inside time fixtures
This helps compatibility with implementations that
lack support for mutable strings (e.g. Opal).
Add "The defined? keyword for ivars" spec
Back-ported from opal/opal