Here is a bytes type. It's very minimal but it's a start.
diff --git a/Makefile.pre.in b/Makefile.pre.in
index f8a7481..c3af94c 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -278,6 +278,7 @@
Objects/abstract.o \
Objects/boolobject.o \
Objects/bufferobject.o \
+ Objects/bytesobject.o \
Objects/cellobject.o \
Objects/classobject.o \
Objects/cobject.o \
@@ -494,6 +495,7 @@
Include/abstract.h \
Include/boolobject.h \
Include/bufferobject.h \
+ Include/bytesobject.h \
Include/ceval.h \
Include/classobject.h \
Include/cobject.h \