Single checkbox for "is not empty" filter

Seems to be a dup of https://www.drupal.org/project/better_exposed_filters/issues/2921024 🐛 Not possible to unselect the checkbox Active

@smustgrave, that issue is for a different version and for a boolean field; i'm currently using 8.x-3.0-rc2 and have a decimal field (the filter widget doesn't have a checkbox option)

That version is unsupported and current branch is 7.0.x

sorry i misread the version i have; it is currently 6.0.3. is this "is not empty" checkbox feature supported in later 6.0.6 or 7.0.2 versions?