Document &val does not convert No/Nl chars by design

http://colabti.org/irclogger/irclogger_log/perl6?date=2016-07-04#l931
rakudo/rakudo@e28305c

Author: zoffixznet

doc/Type/Str.pod6

@@ -1392,6 +1392,11 @@ cannot parse the string as a number.
     say val("42.0").^name;  # OUTPUT: «RatStr␤»
     say val("42+0i").^name; # OUTPUT: «ComplexStr␤»
 
+While C<Nl> and C<No> characters can be used as numeric literals
+in the language, the will not be converted to a number by C<val>, by design.
+See L«unival|/routine/unival» if you need to convert such characters to
+C<Numeric>.
+
 =end pod
 
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