Merge pull request #3263 from Raku/blob-8163264

Document classes blob8, blob16, blob32 and blob64

Author: JJ

doc/Type/Blob.pod6

@@ -9,6 +9,30 @@
 The C<Blob> role is an immutable interface to binary types, and offers a
 list-like interface to lists of integers, typically unsigned integers.
 
+However, it's a parameterized type, and you can instantiate with several
+integer types:
+
+=for code
+my $b = Blob[int32].new(3, -3, 0xff32, -44);
+say $b; # OUTPUT: «Blob[int32]:0x<03 -3 FF32 -2C>»
+
+By default, C<Blob> uses 8-bit unsigned integers, that is, it is
+equivalent to Blob[uint8]. Some other types of C<Blob>s which are used
+often get their own class name.
+
+X<|blob8>X<|blob16>X<|blob32>X<|blob64>
+=begin table
+blob8 | Blob[uint8]
+blob16 | Blob[uint16]
+blob32 | Blob[uint32]
+blob64 | Blob[uint64]
+=end table
+
+You can use these in pretty much the same way you would with C<Blob>:
+
+    my $blob = blob8.new(3, 6, 254);
+    say $blob; # OUTPUT: «Blob[uint8]:0x<03 06 FE>␤»
+
 =head1 Methods
 
 =head2 method new