Toss some tests relying on out-dated design.

Str is always NFG now, and we have Uni and Buf for the other levels.
Removing the tests as we have others that cover these issues in line
with current design and more extensively.

S02-types/unicode.t

@@ -1,7 +1,7 @@
 use v6;
 
 use Test;
-plan 16;
+plan 7;
 
 #L<S02/"Methods on Arrays"/".bytes, .codes or .graphs">
 
@@ -28,23 +28,4 @@ is $u.chars, 1, '.chars defaults to .graphs';
     is $rt65170.chars, 1, '.chars defaults to .graphs (3)';
 }
 
-#L<S02/"Units of Position Arguments"/"coerce to the proper units">
-    $u = "\x[41,
-            E1,
-            41, 0300,
-            41, 0302, 0323,
-            E0]";
-
-#?rakudo 9 skip 'Bytes/Codes/Graphs NYI'
-is EVAL('substr $u, 3.as(Bytes),  1.as(Bytes)'),  "\x[41]",             'substr with Bytes as units - utf8';
-is EVAL('substr $u, 3.as(Codes),  1.as(Codes)'),  "\x[0300]",           'substr with Codes as units - utf8';
-is EVAL('substr $u, 4.as(Graphs), 1.as(Graphs)'), "\x[E0]",             'substr with Graphs as units - utf8';
-is EVAL('substr $u, 3.as(Graphs), 1.as(Codes)'),  "\x[41]",             'substr with Graphs and Codes as units 1 - utf8';
-is EVAL('substr $u, 4.as(Codes),  1.as(Graphs)'), "\x[41, 0302, 0323]", 'substr with Graphs and Codes as units 2 - utf8';
-is EVAL('substr $u, 4.as(Bytes),  1.as(Codes)'),  "\x[0300]",           'substr with Bytes and Codes as units 1 - utf8';
-is EVAL('substr $u, 1.as(Codes),  2.as(Bytes)'),  "\x[E1]",             'substr with Bytes and Codes as units 2 - utf8';
-is EVAL('substr $u, 3.as(Bytes),  1.as(Graphs)'), "\x[41, 0300]",       'substr with Bytes and Graphs as units 1 - utf8';
-is EVAL('substr $u, 3.as(Graphs), 1.as(Bytes)'),  "\x[41]",             'substr with Bytes and Graphs as units 2 - utf8';
-
-
 #vim: ft=perl6