A program that spelled "stack" anywhere treated every computed-key read on a checked-dynamic value as a possible read of an error's stack, so it kept a source frame in every function. The key of such a read now counts only when it can be "stack": a string literal answers by its value; a number, bigint or boolean key, or one converted from such a value, cannot be "stack"; an immutable local answers with its one initializer, and a parameter of a function the program only calls by name answers with the arguments its call sites pass. Any other key counts when the program spells "stack", as before.
Chris Tate
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