Revert "Fix #705 (--argfile weirdness)"

This reverts commit 3d2ab93b11.

docs/content/3.manual/manual.yml

@@ -215,9 +215,7 @@ sections:
         value to the jq program as a predefined variable. If you run jq
         with `--argfile foo bar`, then `$foo` is available in the
         program and has the value resulting from parsing the content of
-        the file named `bar`.  The file is slurped.  That means the
-        value loaded will be an array of the top-level JSON values found
-        in the file.
+        the file named `bar`.
 
   - title: Basic filters
     entries:

main.c

@@ -320,6 +320,8 @@ int main(int argc, char* argv[]) {
           ret = 2;
           goto out;
         }
+        if (jv_get_kind(data) == JV_KIND_ARRAY && jv_array_length(jv_copy(data)) == 1)
+            data = jv_array_get(data, 0);
         arg = jv_object_set(arg, jv_string("value"), data);
         program_arguments = jv_array_append(program_arguments, arg);
         i += 2; // skip the next two arguments