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easyControl Flow

A developer checks whether a variable is set before using it. What does this code print, and which call exposes a silent logic error?

Code
def process(value=None):
    if value:
        return f"processing: {value}"
    return "nothing to process"

print(process(None))
print(process("data"))
print(process(0))
print(process([]))
print(process(False))
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