Can `Geometry` be `Send`?

[lnicola]

As asked by @ManeraKai in #522 (comment).

I don't see a reason for it to be !Send, but I might be missing something.

[ManeraKai]

This too: https://gdal.org/user/multithreading.html

Those restrictions apply to the C and C++ ABI, and all languages bindings (unless they would take special precautions to serialize calls)

Rust does have Mutex to serialize calls.

[lnicola]

I'd rather not add a mutex to every geometry (or worse, use a global one). Not to mention that you could still bypass it by getting the native handle.

Anyway, I see no reason to do it.