MidiList doesn't like -1

[d.healey]

Putting the value -1 in a MIDI list doesn't work as expected. It keeps outputting whatever previous value has been stored in the element. In this snippet I fill the list with 0s but it could be any value. However if I store -5 it outputs just fine so seems to only be -1 it doesn't like.

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[Christoph Hart]

-1 is the value for "nothing in there", so it might behave a little bit funky if you actually want that value. But I'll take a look.