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Note that you often see ratios surrounded by parentheses in
framingRatio: expressions. The parentheses are mandatory, because,
without them, Smalltalk would misunderstand your meaning. For example,
if you strip the parentheses from 3/4 @ (5/8), you have
3/4 @ 5/8, which Smalltalk interprets as (3/4 @ 5) / 8,
which is (3/32) @ (5/8).