Bitwise cleanup: Fix opSlice index error. Add unittests and changelog entry

changelog.dd

@@ -18,6 +18,9 @@ $(BUGSTITLE Library Changes,
         has been deprecated.))
     $(LI $(RELATIVE_LINK2 has-function-attributes, Added `std.traits.hasFunctionAttributes`
         as a user-friendly way to query for function attributes.))
+    $(LI $(RELATIVE_LINK2 bitwise, Added `std.range.bitwise` to create
+        a bitwise adapter over an integral type range, consuming the range elements
+        bit by bit.))
 )
 
 $(BUGSTITLE Library Changes,
@@ -106,6 +109,18 @@ static assert(!hasFunctionAttributes!(myFunc!bool, "shared"));
 -------
 )
 
+$(LI $(LNAME2 bitwise, `std.range.bitwise` creates a bit by bit adapter
+    over an integral type range.)
+-------
+import std.range : bitwise;
+ubyte[] arr = [3, 9];
+auto r = arr.bitwise;
+
+r[2] = 1;
+assert(arr[0] == 7);
+-------
+)
+
 )
 
 Macros:

changelog/std-range-bitwise.dd

@@ -0,0 +1,11 @@
+Added `std.range.bitwise` to create a bitwise adapter over an integral type range, consuming the range elements bit by bit.
+
+`std.range.bitwise` creates a bit by bit adapter over an integral type range.
+-------
+import std.range : bitwise;
+ubyte[] arr = [3, 9];
+auto r = arr.bitwise;
+
+r[2] = 1;
+assert(arr[0] == 7);
+-------