Make Signature.ACCEPTS coerce args to Capture

- Instead of relying to Any.ACCEPTS to always give False
- We already did do this for Positional and Associative arguments

src/core/Signature.pm

@@ -8,18 +8,12 @@ my class Signature { # declared in BOOTSTRAP
     #   has Num $!count;          # count
     #   has Code $!code;
 
+    multi method ACCEPTS(Signature:D: Mu \topic) {
+        nqp::p6bool(try self.ACCEPTS: topic.Capture)
+    }
     multi method ACCEPTS(Signature:D: Capture $topic) {
         nqp::p6bool(nqp::p6isbindable(self, nqp::decont($topic)));
     }
-
-    multi method ACCEPTS(Signature:D: @topic) {
-        self.ACCEPTS(@topic.Capture)
-    }
-
-    multi method ACCEPTS(Signature:D: %topic) {
-        self.ACCEPTS(%topic.Capture)
-    }
-
     multi method ACCEPTS(Signature:D: Signature:D $topic) {
         my $sclass = self.params.classify({.named});
         my $tclass = $topic.params.classify({.named});