Still can't work out how to suppress leading zeroes in clock

[unikitty37]

When I try this in my config, it should just show the day of the month with no padding for single-digit days:

"clock": {
  "format": "{:%-d}"
}

but when I run with --log-level trace this produces clock: chrono format error: Invalid specifier in chrono-specs (yes, that is a double space, so it looks like it's trying to print something and not finding it. If I omit the -, it displays the date, but does so incorrectly before the 10th of the month.

The documentation at https://fmt.dev/12.0/syntax/#chrono-format-specifications implies this should work.

What should I be putting? It looks like fmt 12 is being used, which matches the documentation. (I'm running Waybar v0.14.0 on Arch.)