in cxx/fbjni/detail/CoreClasses-inl.h [458:469]
static void allocate(
alias_ref<typename jtype_traits<T>::array_type> array,
jsize start,
jsize length,
T** elements,
size_t* size,
jboolean* isCopy) {
(void) start;
(void) length;
*elements = array->getElements(isCopy);
*size = array->size();
}