add note about bigint capability

Author: tbrowder

doc/Language/pod.pod6

@@ -62,7 +62,7 @@ Perl6-ish option pairs. That is, any of:
 Where '$e1, $e2, ...' are list elements of type String, Int, Number, or
 Boolean.  Lists may have mixed element types. Note that one-element
 lists are converted to the type of their element (String, Int, Number, or
-Boolean).
+Boolean). Also note that "bigints" can be used if required.
 
 For hashes, '$k1, $k2, ...' are keys of type Str and '$v1, $2, ...'
 are values of type String, Int, Number, or Boolean.