patch 9.1.1668: items() does not work for Blobs

Problem:  items() does not work for Blobs
Solution: Extend items() to support Blob
          (Yegappan Lakshmanan).

closes: #18080

Signed-off-by: Yegappan Lakshmanan <yegappan@yahoo.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/doc/builtin.txt

@@ -1,4 +1,4 @@
-*builtin.txt*	For Vim version 9.1.  Last change: 2025 Aug 20
+*builtin.txt*	For Vim version 9.1.  Last change: 2025 Aug 23
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -344,7 +344,7 @@ isinf({expr})			Number	determine if {expr} is infinity value
 					(positive or negative)
 islocked({expr})		Number	|TRUE| if {expr} is locked
 isnan({expr})			Number	|TRUE| if {expr} is NaN
-items({expr})			List	key-value pairs in {expr}
+items({expr})			List	key/index-value pairs in {expr}
 job_getchannel({job})		Channel	get the channel handle for {job}
 job_info([{job}])		Dict	get information about {job}
 job_setoptions({job}, {options}) none	set options for {job}
@@ -6314,7 +6314,8 @@ items({expr})						*items()*
 		Return a |List| with all key/index and value pairs of {expr}.
 		Each |List| item is a list with two items:
 		- for a |Dict|: the key and the value
-		- for a |List|, |Tuple| or |String|: the index and the value
+		- for a |List|, |Tuple|, |Blob| or |String|: the index and the
+		  value
 		The returned |List| is in arbitrary order for a |Dict|,
 		otherwise it's in ascending order of the index.
 
@@ -6328,6 +6329,7 @@ items({expr})						*items()*
 			echo items([1, 2, 3])
 			echo items(('a', 'b', 'c'))
 			echo items("foobar")
+			echo items(0z0102)
 <
 		Can also be used as a |method|: >
 			mydict->items()

runtime/doc/usr_41.txt

@@ -1,4 +1,4 @@
-*usr_41.txt*	For Vim version 9.1.  Last change: 2025 Aug 18
+*usr_41.txt*	For Vim version 9.1.  Last change: 2025 Aug 23
 
 		     VIM USER MANUAL - by Bram Moolenaar
 
@@ -920,6 +920,7 @@ Blob manipulation:					*blob-functions*
 	reverse()		reverse the order of numbers in a blob
 	index()			index of a value in a Blob
 	indexof()		index in a Blob where an expression is true
+	items()			get List of Blob index-value pairs
 
 Other computation:					*bitwise-function*
 	and()			bitwise AND

runtime/doc/version9.txt

@@ -41648,6 +41648,8 @@ Other new features ~
 - Add the new default highlighting groups "Bold", "Italic" and "BoldItalic"
   for use in syntax scripts.
 
+- |items()| function now supports Blob.
+
 							*changed-9.2*
 Changed~
 -------