Version 1, Update 99

This version contains a partial revert of update 1.98.

In 1.98, we removed the nullable ? modifier from the TypeScript type annotations for boundVariables. boundVariables is indeed non-nullable when reading objects from the Plugin API, but several of the affected types, such as Paint and Effect, are used for writing. In the write path, boundVariables is optional. Removing the nullable modifier caused typechecker errors in otherwise valid code. The nullable modifier has been added back in 1.99. Apologies to everyone who encountered difficulties, and apologies to anyone affected by the additional churn from this update!

Note that this version only affects TypeScript type definitions. No runtime behavior is affected. We intend to release a typings update in the future that makes boundVariables non-nullable in specific situations, but the second attempt will more carefully address the write path.