vim-patch:9.1.0329: String interpolation fails for Dict type (#28335)

Problem:  String interpolation fails for Dict type
Solution: Support Dict data type properly, also support :put =Dict
          (without having to convert it to string() first)
          (Yegappan Lakshmanan)

fixes: vim/vim#14529
closes: vim/vim#14541

f01493c550

Co-authored-by: Yegappan Lakshmanan <yegappan@yahoo.com>

runtime/doc/builtin.txt

@@ -7876,10 +7876,10 @@ string({expr})                                                        *string()*
 		for infinite and NaN floating-point values representations
 		which use |str2float()|.  Strings are also dumped literally,
 		only single quote is escaped, which does not allow using YAML
-		for parsing back binary strings.  |eval()| should always work for
-		strings and floats though and this is the only official
-		method, use |msgpackdump()| or |json_encode()| if you need to
-		share data with other application.
+		for parsing back binary strings.  |eval()| should always work
+		for strings and floats though, and this is the only official
+		method.  Use |msgpackdump()| or |json_encode()| if you need to
+		share data with other applications.
 
 strlen({string})                                                      *strlen()*
 		The result is a Number, which is the length of the String

runtime/doc/change.txt

@@ -1291,8 +1291,8 @@ expression (like with the "/" command).
 The expression must evaluate to a String.  A Number is always automatically
 converted to a String.  For the "p" and ":put" command, if the result is a
 Float it's converted into a String.  If the result is a List each element is
-turned into a String and used as a line.  A Dictionary or FuncRef results in
-an error message (use string() to convert).
+turned into a String and used as a line.  A Dictionary is converted into a
+String.  A FuncRef results in an error message (use string() to convert).
 
 If the "= register is used for the "p" command, the String is split up at <NL>
 characters.  If the String ends in a <NL>, it is regarded as a linewise

runtime/lua/vim/_meta/vimfn.lua

@@ -9353,10 +9353,10 @@ function vim.fn.stridx(haystack, needle, start) end
 --- for infinite and NaN floating-point values representations
 --- which use |str2float()|.  Strings are also dumped literally,
 --- only single quote is escaped, which does not allow using YAML
---- for parsing back binary strings.  |eval()| should always work for
---- strings and floats though and this is the only official
---- method, use |msgpackdump()| or |json_encode()| if you need to
---- share data with other application.
+--- for parsing back binary strings.  |eval()| should always work
+--- for strings and floats though, and this is the only official
+--- method.  Use |msgpackdump()| or |json_encode()| if you need to
+--- share data with other applications.
 ---
 --- @param expr any
 --- @return string