Some spacing tweaks to predicates

types/src/predicates.rs

@@ -20,12 +20,16 @@ pub trait IsChar {
 pub trait IsNumber {
     /// Is this thing a number?
     fn is_number(&self) -> bool { self.is_complex() || self.is_real() || self.is_rational() || self.is_integer() }
+
     /// Should return `true` if this Value is a complex number type.
     fn is_complex(&self) -> bool { self.is_real() }
+
     /// Should return `true` if this Value is a real number type.
     fn is_real(&self) -> bool { self.is_rational() }
+
     /// Should return `true` if this Value is a rational number type.
     fn is_rational(&self) -> bool { self.is_integer() }
+
     /// Should return `true` if this Value is a integer number type.
     fn is_integer(&self) -> bool { false }
 }