Jetpack Compose version: 1.4.0-rc01
Jetpack Compose Material 3 version: 1.1.0-alpha08
Android Studio Build: Android Studio Giraffe | 2022.3.1 Canary 8
Kotlin version: 1.8.10

DateRangePicker doesn't allow selecting a range of 1 day (a range starting and ending on the same day). Date range picker from com.google.android.material:material:1.8.0 allows 1-day ranges. Another example is the Pixel clock app allows 1-day ranges when pausing alarms. In general this is a valid edge use case.

Looks like DateInputValidator marks a range like this invalid, but it's unclear if this is on purpose. The code is surrounded with comments that say "Additional validation when the InputIdentifier is for start of end dates in a range input" and "The input start date is after the end date, or the end date is before the start date." which strikes me as something where the intent wasn't to also reject when start date and end date are equal.