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a struct is just structured data
human level: grouping fields together
machine level: grouping memory together

(a struct is) a named set of values that occupy a block of memory. … A struct occupies a contiguous block of memory, → struct (C programming language)

adding paddings to a struct, The Go Programming Language:

struct {
	x, y int
	_ float32  // padding
	A *[]int
	F func()
}

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