I was trying to understand the grammar of the range formatters here:
https://fmt.dev/latest/syntax/#range-format-specifications

it is stated to be:
range_format_spec ::= ["n"][range_type][range_underlying_spec]
is supposed to be
range_format_spec ::= ["n"][range_type][":" range_underlying_spec]

I assume that the range_underlying_spec is the format_spec fot the the underlaying type, like for example:
https://fmt.dev/latest/syntax/#format-spec](https://fmt.dev/latest/syntax/#format-spec

which does not include the ":"

Or am I missing something?

would be great with an example that specifies both the (n|range_type) and the range_underlying_spec at the same time