fix: Fix optional bools in JNI structs #283
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Fixes an error where structs that contain optional bools where not properly converted from Java to C++.
The reason this failed is because a Java boolean is not the same as a C++ boolean in JNI. It is an
unsigned char, whereas a C++ boolean is abool.This cannot be implicitly converted, so we have to wrap booleans with
static_cast<bool>(value)in order for it to work. This is what this PR now does.And it adds the code to the example so it doesn't break in the future anymore.