[S15] Fix ord(s) to work on all Stringy.

This presumes that Unicodey does Stringy. If not, then you simply need
to add the signatures for Unicodey things where these changes were made.

Additionally, some clarification on .chr(s).

Author: ShimmerFairy

S15-unicode.pod

@@ -290,19 +290,20 @@ C<Hash>.
 
 =head2 Numeric Codepoint
 
-    ord(Str $char) --> Int
-    ords(Str $string) --> Array[Int]
+    ord(Stringy $char) --> Int
+    ords(Stringy $string) --> Array[Int]
 
-    Str.ord() --> Int
-    Str.ords() --> Array[Int]
+    Stringy.ord() --> Int
+    
+    Stringy.ords() --> Array[Int]
 
-The C<&ord> function (and corresponding C<Str.ord> method) return the codepoint
-number of the first codepoint of the string. The C<&ords> function and method
-returns an C<Array> of codepoint numbers for every codepoint in the string.
+The C<&ord> function (and corresponding C<Stringy.ord> method) return the
+codepoint number of the first codepoint of the string. The C<&ords> function and
+method returns an C<Array> of codepoint numbers for every codepoint in the
+string.
 
-[Conjecture: should there be a C<:raw> adverb or C<&raword> function that allows
-you to access NFG codepoints, i.e. get negative numbers? Seems useless given how
-those numbers work, but you never know...]
+This works on any type that does the C<Stringy> role. Note that using this on
+type C<Str> may return invalid negative numbers as "codepoints".
 
 =head2 Character Representation
 
@@ -321,7 +322,11 @@ encoded codepoints).
 
 An error will occur if the C<Str> generated by these functions contains an
 invalid character or sequence of characters. This includes, but is not limited
-to, codepoint values greater than C<0x10FFFF> and parts of surrogate code pairs.
+to, codepoint values greater than C<0x10FFFF> and parts of surrogate code pairs,
+and negative numbers.
+
+The ability to convert negative number codepoints (i.e. C<Str.ords>) is not
+guaranteed and therefore currently disallowed.
 
 =head2 Character Name