Move all Real versions of .abs to Real.abs, remove "multi" from all .…

…abs definitions.

src/core/Any-num.pm

@@ -1,5 +1,5 @@
 augment class Any {
-    multi method abs() {
+    method abs() {
         pir::abs__Nn(self.Num);
     }
 

src/core/Complex.pm

@@ -13,7 +13,7 @@ class Complex does Numeric {
         ($topic.Num ~~ $.re) && ($.im == 0);
     }
 
-    multi method abs() {
+    method abs() {
         ($!re * $!re + $!im * $!im).sqrt
     }
 

src/core/Int.pm

@@ -14,10 +14,6 @@ our sub upgrade_to_num_if_needed($test) {
 }
 
 augment class Int does Real {
-    multi method abs() {
-        self < 0 ?? -self !! self;
-    }
-
     multi method ACCEPTS(Int $other) {
         self == $other;
     }

src/core/Num.pm

@@ -62,10 +62,6 @@ augment class Num does Real {
         ($signum * $b) / $d;
     }
 
-    multi method abs() {
-        pir::abs__Nn(self);
-    }
-
     multi method exp() {
         pir::exp__Nn(self);
     }

src/core/Rat.pm

@@ -57,10 +57,6 @@ class Rat does Real {
         Rat.new($!numerator - $!denominator, $!denominator);
     }
 
-    multi method abs() {
-        self < 0 ?? -self !! self;
-    }
-
     our Int multi method sign {
         # self ~~ NaN ?? NaN !! self <=> 0;
         self < 0 ?? -1 !! ( self == 0 ?? 0 !! 1);

src/core/Real.pm

@@ -1,3 +1,5 @@
 role Real does Numeric {
-    # no methods yet
+    method abs() {
+        self < 0 ?? -self !! self;
+    }
 }