Gemstone doesn't like widestring method definitions.
MCMethodDefinition allInstances select: [ :each | (each source isKindOf: ByteString) not ]
should return an empty collection. In Pharo 3.0 it does.
In Moose 4.8 however we have
VerveineJTestResource>mse MalPorterStemmerTest>porterTestData MalStopwords>moreBasicEnglish MalGermanStemmer>performStemming: PPAnalyzerTest>grammarD
Stephan