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you are welcome to do that and send a PullRequest :)

It is a huge amount of work that I don't have time for further development of Groot right now.

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I am tempted to say that it is impossible, but let's just say it is very hard to implement:

Groot and the BT.CPP executor are lously coupled and communicate over flatbuffer.

You change would involve a new flatbuffer protocol that include that. And about the values, do not forget that ANY C++ type is allowed.

Even if I serialize that, how can I make a user defined C++ type visible in Groot? I can not.

So, no, this will not happen, sorry.

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we may of course limit the scope to only types that are strings or can be converted to string (line numbers). That would be very limiting, but better than nothing.

Still a lot of work that I have no time to do, unfortunately.

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Would there be a way to make a mechanism that allows easy adding of such types? I haven't worked with flatbuffer, but won't creating schemas or using https://google.github.io/flatbuffers/flexbuffers.html help? Also if a custom type had an overloaded << operator for string representation, would that help?

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