Function nullable

Function to be used to construct an update object. If value is undefined - property will not be updated. If value is null - it will be set. Useful for Date properties. Example:

   await update('table_name',
     {
       title: element.title,
       ...nullable(element.released, val => ({ released: val })),
     },
     { id: elementId },
   ).run(ctx);
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