Update sum-type.md

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Arijit Basu 10 months ago committed by GitHub
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@ -16,8 +16,8 @@ tables just below.
Yes, they are actually sum types, i.e. they can be any of the given set of
tagged variants listed there.
Notice the word "be". Unlike classes or structs (aka product types), they don't
"have" values, they "are" (i.e. "be") the value, or rather, one of the possible
Notice the word "be". Unlike classes or structs (aka product types), they can't
"have" values, they can only "be" the value, or rather, be one of the possible
set of values.
Also notice the word "tagged". Unlike the single variant `null`, or the dual

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