`sizeof` on custom struct does not check fields

General Usage
2

Use:

help?> Base.summarysize
  Base.summarysize(obj; exclude=Union{...}, chargeall=Union{...}) -> Int


  Compute the amount of memory, in bytes, used by all unique objects reachable
  from the argument.

  Keyword Arguments
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    •  exclude: specifies the types of objects to exclude from the
       traversal.

    •  chargeall: specifies the types of objects to always charge the
       size of all of their fields, even if those fields would normally
       be excluded.

  See also sizeof.

  Examples
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  julia> Base.summarysize(1.0)
  8
  
  julia> Base.summarysize(Ref(rand(100)))
  848
  
  julia> sizeof(Ref(rand(100)))
  8
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