more Parameter docs

lib/Parameter.pod

@@ -41,4 +41,45 @@ Returns C<True> for slurpy parameters
 
 Returns C<True> for optional parameters
 
+=head2 parcel
+
+Returns C<True> for parcel parameters
+
+    sub f(\$parcel, $non-parcel) { }
+
+=head2 capture
+
+Returns C<True> for parameters that capture the rest of the argument list
+
+    sub f(\capture) { }
+
+=head2 rw
+
+Returns C<True> for C<is rw> parameters
+
+=head2 copy
+
+Returns C<True> for C<is copy> parameters
+
+=head2 readonly
+
+Returns C<True> for read-only parameters (the default)
+
+=head2 invocant
+
+Returns C<True> if the parameter is the invocant parameter.
+
+=head2 default
+
+Returns a closure that upon invocation returns the default value for
+this paraemter, or C<Any> if no default was provided.
+
+=head2 type_captures
+
+Returns a list of variable names of type captures associated with this
+parameter
+
+    sub a(::T ::U $x) { }
+    say &a.signature.params[0].type_captures;   # T U
+
 =end pod