Quote: for read-only types, use 'mutable' for variables and return values that are not part of the conceptual state; e.g., debugging output, counters, internal caches
Topic: immutable files and data
Topic: data type by access rights
Quotation Skeleton
["Besides return types] The 'mutable' modifier may also be used … output can be marked as 'mutable', making them … return values that are not part of the …
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Topic: immutable files and data (57 items)
Topic: data type by access rights (20 items)