Changes related to RT #129945

Fixes RT #125026 and bypasses issues mentioned in RT #124279 as
gather/take is no longer used internally.  Still need to look at the
behaviour tested for RT #77408

S05-modifier/counted-match.t

@@ -66,7 +66,6 @@ my $data = "f fo foo fooo foooo fooooo foooooo";
     is @match, <foo fooo foooo fooooo foooooo>, 'nth(infinite range) matched correctly';
 }
 
-#?rakudo todo 'RT #125026'
 #?niecza skip 'hangs'
 {
     my @match = $data.match(/fo+/, :nth(2, 4 ... *)).list;
@@ -92,14 +91,13 @@ my $data = "f fo foo fooo foooo fooooo foooooo";
 
 # test that non-monotonic items in :nth lists are ignored
 #?niecza todo
-#?rakudo.jvm skip 'RT #124279'
 {
-    is 'abacadaeaf'.match(/a./, :nth(2, 1, 4)).join(', '),
-        'ac, ae', 'non-monotonic items in :nth are ignored';
-    is 'abacadaeaf'.match(/a./, :nth(2, -1, 4)).join(', '),
-        'ac, ae', 'negative non-monotonic items in :nth are ignored';
-    is 'abacadaeaf'.match(/a./, :nth(2, 0, 4)).join(', '),
-        'ac, ae', 'zero non-monotonic items in :nth are ignored';
+    throws-like '"abacadaeaf".match(/a./, :nth(2, 1, 4)).join', Exception,
+        'non-monotonic items in :nth throw';
+    throws-like '"abacadaeaf".match(/a./, :nth(2, -1, 4)).join', Exception,
+        'negative non-monotonic items throw';
+    throws-like '"abacadaeaf".match(/a./, :nth(2, 0, 4)).join', Exception,
+        'zero non-monotonic items throw';
 }
 
 # RT #77408