TypeScript is great for checking variables at the type level. For example, you can specify that the age property for a User should be a number. However, you canât always be sure what youâre going to get from a form input. TypeScript will present an error if itâs not a number, but on its own it doesnât know if a number is too low or too high to be realistic for your use case. Thereâs a similar prob


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