fix: Make BooleanType handle 0 correctly #58
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The tests BooleanType had a typo causing them to skip testing serialization of and casting of 0. This meant that even though it treated 0 as a truthy value, it was not caught by the tests.
Instead, BooleanType now uses a list of truthy values for serialization, which now includes 0. This fixes the handling, and the tests have been updated to enforce this behaviour.