"a\x{266F}/b\x{266D}" is equivalent to "a♯/b♭". You should see your expected result if you print join "\n", keys %helmholtz_to_midi. Data::Dump outputs in an escaped form, just in case.

#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

In reply to Re: utf8 hash keys revisited: How can i use musical symbols as hash keys? by kennethk
in thread utf8 hash keys revisited: How can i use musical symbols as hash keys? by karlgoethebier

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