All behaviors are compatible with previous version.

Row height won't be auto adjusted when cell's value or properties are changed on UI of Spread, all auto fit row height will be treated as custom row height

Fallbacks to old behaviors of calculation engine.

Any attempt to set a value to a cell that contains a formula to fail and instead raise the Error event.

New behaviors will be applied automatically in new releases.

The cell text will be exported if there is an explicit cell type.

Initialized values of some properties will be different compared with previous versions.

Initialized values of sheetview's Protect and cell's lock will be different compared with previous versions.

All style default settings and behaviors will be compatible with previous version.