Option to Collapse Range Output

[AeonSake]

I know that this topic has been mentioned/discussed e.g. in #3 and #22 but I'd like to reiterate that from a dev/user perspective, it is not obvious that the formatRange() result will be automatically extended to more than the date fields specified in the options. Especially since the normal format() function behavior only returns the fields specified in the format options (because no field extension needed for obvious reasons).
While I'd love to see this to be the default behavior (collapse to the specified date fields), I understand that changing it at this stage would bring more confusion than have benefit. However I really would like to emphasise the need for at least an additional option field to define to either ignore all unspecified date fields or collapse to a given date field.
Examples were mentioned in the issues listed above but include e.g.:
10 PM - 6 AM
Dec 1 - Jan 1
I am currently forced to build those date ranges myself as I cannot use formatRange() to handle those ranges correctly/properly for my use case.