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Inflow's Amount value object rejects anything above one million, and the wallet balance is an Amount. Two legal credits of six hundred thousand leave a wallet that can still take money in and can never be read or spent again.
Trill extracts story-text validation into an IStoryTextFactory and leaves the value object's constructor public - plus an implicit conversion from string, so any assignment builds an unvalidated StoryText in one keystroke.
Availability's Resource aggregate enforces one real business rule - a higher-priority reservation evicts yours and announces it. The invariant, the struct value object behind it, and the day-integer it becomes on disk.
