%% does not work properly

[sparkprime]

dcunnin@tyrion:~$ jsonnet -e '"%% %d" % 95'
RUNTIME ERROR: Not enough values to format, got 1
        std.jsonnet:538:29-87   thunk <val>
        std.jsonnet:543:41-43   thunk <val>
        std.jsonnet:442:29-31
        std.jsonnet:442:20-32   thunk <a>
        std.jsonnet:442:20-44   function <anonymous>
        std.jsonnet:442:20-44   function <format_code>
        std.jsonnet:543:29-73   thunk <s>
        std.jsonnet:548:38      thunk <str>
        std.jsonnet:355:36-38
        std.jsonnet:355:25-39   thunk <w>
        ...
        std.jsonnet:347:20      function <aux>
        std.jsonnet:351:13-22   function <padding>
        std.jsonnet:355:13-43   function <pad_left>
        std.jsonnet:548:29-52   thunk <s_padded>
        std.jsonnet:549:69-76   thunk <v>
        std.jsonnet:549:21-77   function <format_codes_arr>
        std.jsonnet:549:21-77   function <format_codes_arr>
        std.jsonnet:597:13-53   function <anonymous>
        std.jsonnet:134:13-28   function <anonymous>
        <cmdline>:1:1-12

Although for some reason this is OK:

dcunnin@tyrion:~$ jsonnet -e '"%d %%" % 95'
"95 %"