Since 'a' is true, ('a' or ...anything...) is the same as 'a'. Therefore,
when ('a' or 'b') is the same as when ('a')
when ('a' or $_ ~~ 'b') is the same as when ('a')

The third one is wrong too. It'll say yes no matter what $x contains since ($_ ~~ 'a' or 'b') is always true. 

test('c')

[download]
gives 
N
N
Y

[download]

In reply to Re: Odd behavior of given {when (... or ...) ...} by ikegami
in thread Odd behavior of given {when (... or ...) ...} by Polynomial

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