What are MemoryLayout<T>.size, stride, and alignment, and why can the three differ? Use the struct below as your example.
struct A { var a: Bool; var b: Int64; var c: Bool }size is the actual data bytes, alignment is the constraint on the start address, and stride is the distance to the next element in an array (size rounded up to alignment). They differ because of the padding between fields and at the end.
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