# Functions
Hashable returns true if the type can used as map key see https://blog.golang.org/maps.
HasUnexportedField returns true if the struct has unexported fields.
https://stackoverflow.com/questions/36310538/identify-non-builtin-types-using-reflect?answertab=votes#tab-top.
IsCustomType returns true if the type is not predeclared.
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IsUnexportedField returns true if the structField is not exported.