patch 9.1.1684: min()/max() does not handle float data types

Problem:  min()/max() does not handle float data types
          (ubaldot)
Solution: Extend min() and max() to every comparable type
          (LemonBoy)

Re-use the logic used for plain old comparison operators, this way we
gain support for float values and unify the logic handling the
comparisons.

fixes: #18052
closes: 18055

Signed-off-by: LemonBoy <thatlemon@gmail.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 23
+*builtin.txt*	For Vim version 9.1.  Last change: 2025 Aug 24
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -7626,7 +7626,7 @@ max({expr})							*max()*
 		Can also be used as a |method|: >
 			mylist->max()
 <
-		Return type: |Number|
+		Return type: any, depending on {expr}
 
 
 menu_info({name} [, {mode}])				*menu_info()*
@@ -7718,7 +7718,7 @@ min({expr})							*min()*
 		Can also be used as a |method|: >
 			mylist->min()
 <
-		Return type: |Number|
+		Return type: any, depending on {expr}
 
 
 mkdir({name} [, {flags} [, {prot}]])			*mkdir()* *E739*

runtime/doc/version9.txt

@@ -1,4 +1,4 @@
-*version9.txt*  For Vim version 9.1.  Last change: 2025 Aug 23
+*version9.txt*  For Vim version 9.1.  Last change: 2025 Aug 24
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -41752,6 +41752,7 @@ Others: ~
   feature, see |socketserver-clientserver|.
 - |CmdlineLeave| sets |v:char| to the character that caused exiting the
   Command-line.
+- |min()|/|max()| can handle all comparable data types.
 
 Platform specific ~
 - MS-Winodws: Paths like "\Windows" and "/Windows" are now considered to be