`authorFeatures` not supported (API out of date?)

[tmaster628]

It looks like the wrapper is using an older version of the API, so I can't create calculators with newer props like authorFeatures, which allows for expressions to be read-only.

[tmaster628]

Update: while it still would be nice to update the supported properties, I figured out that you can make things readonly -- there's an expression prop that isn't included in the API called readonly that defaults to false. Unfortunately, readonly also isn't supported by this library.