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### D.14.5 `mpfr` unary predicates

Each of these predicates takes an `mpfr` number as an argument and performs a logical operation. If the result is true, it returns `(nil,nil)`, and otherwise it returns `nil`.

- `nan_p`
- `inf_p`
- `number_p`
- `zero_p`
- `integer_p`

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