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Quote: use seal and unseal to control subclassing; by class or package
Topic:
security by seal
Topic:
opaque and partially-opaque data types
Quotation Skeleton
[Module subclassing is controlled by] 'seal' and 'unseal' statements, which list a … framework, but to not allow subclassing. … 'unseal' statements are the opposite of 'seal', making … Google-1 Google-2
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Topic: security by seal (16 items)
Topic: opaque and partially-opaque data types (14 items)