Another refactoring topic today: dealing with nulls. There are a bunch of techniques, but they amount to a) don't, and b) do but only one time ever. The basic idea: a null always occurs in a particular context, and in that context, it has a meaning. When we pass it up or down our call-stack, we are changing contexts, and hence changing meanings. We're using the same symbol to mean different things at different times. Using the same generic symbol to mean different things in different contexts is anti-signal. It represents a loss of meaning.
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