Support `today` in queries for custom fields with type date

I have some custom fields with the "date" type.
When I query "due>=today", I get results based on today and all future relevant documents.

However with custom fields the behavior seems to be like this:
"f:customfield>=today" => no results at all
"f:customfield<=today" => results in past and future items (just like "f:customfield:*")

A workaround is to use "hardcoded/dynamic" dates like this:
"f:customfield>=2022-07-15" (whereas 2022-07-15 is today)

I haven't tested other custom fields with other datatypes. But it might be worth a look, if there's a similar issue.

Maybe it's an issue of interpreting "today" rather than the operator...