Cross sum and incremental cross sum

[Mike-3]

Is it possible to include the calculation of the checksum and the incremental checksum in the functionality? Or there is the possibility of triggering external function calls to calculate the function yourself.
We are already using the library, but would like to expand the range of functions.

[fkleon]

Interesting thought.

In the past I've experimented a bit with supporting more powerful functions, but this would require some extensive refactoring of the library internals. The current design does not easily allow to evaluate generic function calls, and does not support assignments making it quite awkward to work with functions (e.g. see this attempt to implement a generic RGB colour encoder as a composite function: 0b04574).

Supporting an external function call may be easier to implement though.

[Mike-3]

The possibility of an external function call would also be great. Everyone can then implement the functionality themselves as required. Would be great if that was possible.

[S-Man42]

I would love to see this opportunity to call external function as well!