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TrimExcess should shrink the buffer when allocated capacity exceeds the logical size (mSize < mAllocSize). The previous comparison never held in valid states.
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Summary
TrimExcess()usedmSize > mAllocSize, which does not occur for a consistent array (allocated capacity should be at least the used length). The intended check is to shrink when there is spare capacity:mSize < mAllocSize.Change
BeefySysLib/util/Array.h: correct the condition so excess storage is actually released when appropriate.