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It uses it as long as there is enough space. Once it fails to find a rectangle to fit a new word, it tries to reduce the size of the word.

In general, word clouds are bad for comparing sizes. For that reason I used plain list in the sidebar on the left (or at the bottom if you are on mobile)

It's humorous that in Go err/nil happens so often that it's "unbelievable" in a literal sense

It looks to me as if it is. There just are a lot of uses of "err" in typical Go code.