Certainly a typo : for the class FloatOrIntUnion, after sending the message rebuildFieldAccessors, the automatically generated code is
...
classVariableNames: 'OFFSET_DENOMINATOR OFFSET_NUMERATOR'
...
but it should be something like
...
classVariableNames: 'OFFSET_AS_FLOAT OFFSET_AS_INT'
...
Page 48 of the pdf file.
Certainly a typo : for the class
FloatOrIntUnion, after sending the messagerebuildFieldAccessors, the automatically generated code is ...classVariableNames: 'OFFSET_DENOMINATOR OFFSET_NUMERATOR'... but it should be something like ...classVariableNames: 'OFFSET_AS_FLOAT OFFSET_AS_INT'...