patch 8.2.2344: using inclusive index for slice is not always desired

Problem:    Using inclusive index for slice is not always desired.
Solution:   Add the slice() method, which has an exclusive index. (closes
            #7408)

runtime/doc/eval.txt

@@ -314,6 +314,9 @@ similar to -1. >
 	:let shortlist = mylist[2:2]	" List with one item: [3]
 	:let otherlist = mylist[:]	" make a copy of the List
 
+Notice that the last index is inclusive.  If you prefer using an exclusive
+index use the |slice()| method.
+
 If the first index is beyond the last item of the List or the second item is
 before the first item, the result is an empty list.  There is no error
 message.
@@ -1217,6 +1220,9 @@ a Number it is first converted to a String.
 In Vim9 script the indexes are character indexes.  To use byte indexes use
 |strpart()|.
 
+The item at index expr1b is included, it is inclusive.  For an exclusive index
+use the |slice()| function.
+
 If expr1a is omitted zero is used.  If expr1b is omitted the length of the
 string minus one is used.
 
@@ -2884,6 +2890,8 @@ sign_unplacelist({list})	List	unplace a list of signs
 simplify({filename})		String	simplify filename as much as possible
 sin({expr})			Float	sine of {expr}
 sinh({expr})			Float	hyperbolic sine of {expr}
+slice({expr}, {start} [, {end}])  String, List or Blob
+					slice of a String, List or Blob
 sort({list} [, {func} [, {dict}]])
 				List	sort {list}, using {func} to compare
 sound_clear()			none	stop playing all sounds
@@ -9862,6 +9870,18 @@ sinh({expr})						*sinh()*
 		{only available when compiled with the |+float| feature}
 
 
+slice({expr}, {start} [, {end}])			*slice()* 
+		Similar to using a |slice| "expr[start : end]", but "end" is
+		used exclusive.  And for a string the indexes are used as
+		character indexes instead of byte indexes, like in
+		|vim9script|.
+		When {end} is omitted the slice continues to the last item.
+		When {end} is -1 the last item is omitted.
+
+		Can also be used as a |method|: >
+			GetList()->slice(offset)
+
+
 sort({list} [, {func} [, {dict}]])			*sort()* *E702*
 		Sort the items in {list} in-place.  Returns {list}.
 

runtime/doc/usr_41.txt

@@ -619,6 +619,8 @@ String manipulation:					*string-functions*
 	submatch()		get a specific match in ":s" and substitute()
 	strpart()		get part of a string using byte index
 	strcharpart()		get part of a string using char index
+	slice()			take a slice of a string, using char index in
+				Vim9 script
 	strgetchar()		get character from a string using char index
 	expand()		expand special keywords
 	expandcmd()		expand a command like done for `:edit`
@@ -648,6 +650,7 @@ List manipulation:					*list-functions*
 	map()			change each List item
 	mapnew()		make a new List with changed items
 	reduce()		reduce a List to a value
+	slice()			take a slice of a List
 	sort()			sort a List
 	reverse()		reverse the order of a List
 	uniq()			remove copies of repeated adjacent items