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• Strings can be coerced to numbers (null if not parsableintegers or reals) and regular expressions. If the string is not parsable as a number, the result is null.
• Numbers can be coerced to strings.
• Regular expressions can be coerced to strings.
• Any expression can be coerced to Boolean.
• null and false can be coerced to 0, and true can be coerced to 1

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