Still to do:
1) use singletons. Creating instances all the time is not acceptable.
2) no empty classes.
3) no empty methods returning self. Leave those unimplemented or use
#subclassResponsibility.
4) methods such as wrongClassIfFloatShape: and
wrongClassIfCharacterShape: make no sense. Just override
checkArgumentClass: instead.
5) #shape: not implemented yet using shapes, as a result #resolveShape:
is unused.
6) no class-method-only classes. Move those to Shape.
Paolo
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