Add Real.{Int,Num,Rat} coercers ref #3782

... and remove non-existent Numeric.{Int,Num,Real} ones

Author: stoned

doc/Type/Numeric.pod6

@@ -35,29 +35,6 @@ Defined as:
 The C<:D> variant simply returns the invocant. The C<:U> variant issues a warning about using
 an uninitialized value in numeric context and then returns C<self.new>.
 
-=head2 method Int
-
-    method Int(Numeric:D: --> Int:D)
-
-If this C<Numeric> is equivalent to a C<Real>, return the equivalent of
-calling C<truncate> on that C<Real> to get an C<Int>. Fail with
-C<X::Numeric::Real> otherwise.
-
-=head2 method Rat
-
-    method Rat(Numeric:D: Real $epsilon = 1.0e-6 --> Rat:D)
-
-If this C<Numeric> is equivalent to a C<Real>, return a C<Rat> which is
-within C<$epsilon> of that C<Real>'s value. Fail with C<X::Numeric::Real>
-otherwise.
-
-=head2 method Num
-
-    method Num(Numeric:D: --> Num:D)
-
-If this C<Numeric> is equivalent to a C<Real>, return that C<Real> as a C<Num>
-as accurately as is possible. Fail with C<X::Numeric::Real> otherwise.
-
 =head2 method narrow
 
     method narrow(Numeric:D --> Numeric:D)

doc/Type/Real.pod6

@@ -68,11 +68,20 @@ it is an L<Int|/type/Int> when we instantiated C<Temperature> with an L<Int|/typ
 Converts the number to a C<Complex> with the number converted to a C<Num> as
 its real part and 0e0 as the imaginary part.
 
+=head2 method Int
+
+    method Int(Real:D:)
+
+Calls the L«C<Bridge> method|/routine/Bridge» on the invocant and then
+calls the L«C<Int> method|/routine/Int» on its return value.
+
 =head2 method Rat
 
     method Rat(Real:D: Real $epsilon = 1e-6)
 
-Converts the number to a C<Rat> with the precision C<$epsilon>.
+Calls the L«C<Bridge> method|/routine/Bridge» on the invocant and then
+calls the L«C<Rat> method|/routine/Rat» on its return value with the
+C<$epsilon> argument.
 
 =head2 method Real
 
@@ -85,6 +94,13 @@ The C<:D> variant simply returns the invocant. The C<:U> variant issues a
 warning about using an uninitialized value in numeric context and then returns
 C<self.new>.
 
+=head2 method Num
+
+    method Num(Real:D:)
+
+Calls the L«C<Bridge> method|/routine/Bridge» on the invocant and then
+calls the L«C<Num> method|/routine/Num» on its return value.
+
 =head2 routine rand
 
     sub term:<rand> (--> Num:D)