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Even the statement true become: false is valid in Smalltalk, although executing it is not recommended. https://en.wikipedia.org/wiki/Smalltalk https://e

• spooneybarger 14y ago
  so in most smalltalk representations, true and false are implemented as primitives so that wouldn't actually do anything but in theory, yes, you can turn true into false and variety of other things. as an aside, people who don't use smalltalk are often drawn to the 'become' functionality which is almost never seen in the wild.