Compatibility

Consistent type coercion when modifying variables

In Scratch 2.0 if you set [var] to [var + 1] and the variable contains a string, you get 1. If you change [var] by [1] when the variable contains a string, you get NaN. In 3.0 both now have the same behavior and return 1.

Consistent rounding method for list indexes

In Scratch 2.0 if you delete [1.5] of [list] it will delete the item at index 2 as the index is rounded. However if you replace item [1.5] of [list] with ["thing"] it will replace the item at index 1 as floor is applied to the index. In 3.0 floor is now applied consistently for all index arguments on list blocks.

Reference: https://github.com/LLK/scratch-vm/issues/202

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Proposed: Consistent direction for "Whirl" graphic effect

Reference: https://github.com/LLK/scratch-render/issues/22