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A spellchecker used to be a major feat of software engineering (2008)
It's not about technology for its own sake. It's about being able to implement your ideas.
That's a quarter megabyte to contain the word processor, the document being edited, and the memory needed by the operating system. (And, for the record, reducing the size of the dictionary from 200,000+ to 50,000 or even 20,000 words was a reasonable option, but even that doesn't leave the door open for a naive approach.) Sure, you could come up with some ways to decrease the load time or reduce the memory footprint, but that's icing and likely won't be needed.
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