[perl #58626] default and when * execute even when another when clause is used

[Stephen Simmons]

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In the attached code, there is a fairly simple example of a case statement
using given/when that has multiple clauses executed.  I assumed from my
reading of S04 that if one of the when block is taken, when it finishes
control exits the innermost given block, though the English is confusing to
me.  However it doesn't and continues on to both the when * clause and the
default clause.
Execution:
sully:perl6 stephensimmons$ adventure_world/a1b.p6
You are at (0, 0) within region outside.
n
Oops!;
What does n mean?
You are at (0, 1) within region outside.

a1b.p6
Description: Binary data