Writes all methods for HyperSeq, refs #1897

doc/Type/HyperSeq.pod6

@@ -20,6 +20,50 @@ it's not intended for direct consumption by the developer.
 
 Returns the underlying iterator.
 
+=head2 method grep
+
+    method grep(HyperSeq:D: $matcher, *%options)
+
+Applies C<grep> to the C<HyperSeq> similarly to how it would do it on a Seq.
+
+=for code
+my @hyped = (^10000).map(*²).hyper;
+@hyped.grep( * %% 3 ).say;
+# OUTPUT: «(0 9 36 81 144
+
+When you use C<hyper> on a C<Seq>, this is the method that is actually called.
+
+=head2 method map
+
+    method map(HyperSeq:D: $matcher, *%options)
+
+Uses maps on the C<HyperSeq>, generally created by application of C<hyper> to
+ a preexisting C<Seq>.
+
+=head2 method invert
+
+    method invert(HyperSeq:D:)
+
+Inverts the C<HyperSeq> created from a C<Seq> by C<.hyper>.
+
+=head2 method hyper
+
+    method hyper(HyperSeq:D:)
+
+Returns the object.
+
+=head2 method race
+
+    method race(HyperSeq:D:)
+
+Creates a C<RaceSeq> object out of the current one.
+
+=head2 method serial
+
+    multi method serial(HyperSeq:D:)
+
+Converts the object to a C<Seq> and returns it.
+
 =head2 method is-lazy
 
     method is-lazy(--> False )