Function isNum

isNum(n): boolean
Checks if a given value is a non-empty string representation of a number.
Parameters
- n: unknown
  The value to be checked.
Returns boolean
Returns true if the value is a non-empty string representation of a number, otherwise false.
Example
```
const result1 = isNum(123); // false
const result2 = isNum("123"); // true
const result3 = isNum("abc"); // false
```

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