I've been working on this nice little calculator here, it's got some functions a simple $calc($2-) doesn't do! I'd like some feedback, how to improve, any features that might be nice, or anything that looks like a bad practice!

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Input something along the lines of: 1m; 2m; 400k; 326.7k; 3.67million, 500800 Get in return: $1,000,000; $2,000,000; $400,000; $326,700, $3,670,000; $500,800