I created this D8-focused issue to avoid confusion between D7 and D8 patches for the issue described in #1934972: Allow open range (from without to or to without from) → .
Needs work
1.0
Code
The change is currently missing an automated test that fails when run with the original code, and succeeds when the bug has been fixed.
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I updated patch #14 to address the "value should be of correct primitive type" error we were receiving. I used a solution similar to https://www.drupal.org/project/drupal/issues/2220381#comment-12771574 → , adding a massageFormValues to the widget to unset empty values. You'll still manually need to update existing DB fields to remove their NOT NULL constraints.