Bug in Kernel: 1. Pharo Image
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from a mail: Re: summary of "float & fraction equality bug"
"Common Lisp calls it floating-point contagion and they voted in 1989 to change comparison behavior to satisfy transitivity. If you write floating point code you should be aware of the fallacies, traps etc. that may arise.
To make the story short, I just filed out a change set from Squeak 5.1 to satisfy some of the concerns in the original post.