Fixed-size arrays in local variables use a stack-allocated descriptor as expected, but all the data for an array is allocated on the heap. However, fixed-size arrays embedded in structures are fully stack-allocated. This means that you can save yourself expensive heap allocations by defining a (Private) type with a single fixed-size array element and using a UDT-typed variable in place of the local fixed-size array. You can optimize the number of allocations you need to load a standard module or create a class instance using the same technique at module-level.
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