Big thanks to @Pankraty for a lot of hard work. Many optimisations went into this build. ClosedXML should be much faster than previously.

.NET Standard 2.0 now supported!

Breaking changes:

• XLPivotField class is no longer public
• IXLRangeAddress.IsInvalid property removed
• IXLRangeAddress.IsValid property added
• XLClearOptions refactors into a flag enum. The applicable Clear() methods were updated accordingly.