Equivalent to the SANE API C enum SANE_Constraint_Type.
SANE_Constraint_Type
https://sane-project.gitlab.io/standard/1.06/api.html#option-value-constraints
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Equivalent to the SANE API C enum
SANE_Constraint_Type.See
https://sane-project.gitlab.io/standard/1.06/api.html#option-value-constraints