Void* should never deref and should allow methods to be attached to it.

lib/std/core/builtin.c3

@@ -362,6 +362,7 @@ macro uint bool.hash(bool b) => (uint)b;
 macro uint typeid.hash(typeid t) => ((ulong)(uptr)t).hash();
 macro uint String.hash(String c) => (uint)fnv32a::encode(c);
 macro uint char[].hash(char[] c) => (uint)fnv32a::encode(c);
+macro uint void*.hash(void* ptr) => ((ulong)(uptr)ptr).hash();
 
 module std::core::builtin @if((env::LINUX || env::DARWIN) && env::COMPILER_SAFE_MODE && env::DEBUG_SYMBOLS);
 import libc;

lib/std/core/dstring.c3

@@ -282,10 +282,10 @@ macro void DString.append(&self, value)
 			self.append_char32(value);
 		$default:
 			$switch
-				$case $assignable(value, Char32):
-					self.append_char32(value);
-				$case $assignable(value, String):
-					self.append_chars(value);
+				$case $defined((Char32)value):
+					self.append_char32((Char32)value);
+				$case $defined((String)value):
+					self.append_chars((String)value);
 				$default:
 					$error "Unsupported type for append – use printf instead.";
 			$endswitch

lib/std/io/stream.c3

@@ -136,7 +136,7 @@ macro usz! print_gen(self, x)
 	$case DString:
 		return self.write(x.str_view());
 	$default:
-		$if $assignable(x, String):
+		$if $defined((String)x):
 			return self.write((String)x);
 		$else
 			return printf("%s", x);