I asked about this in #perl, and the consesus seems to be that it does not clear %details, because
sub part (Selector $is_sheep,
Str *%labels = (sheep => "sheep", goats => "goats"),
*@data
) returns List of Pair
{ ... }
would just do the wrong thing if called as part sheep=>"horse", Animal::Horse, @animals
Update: Just to make it clear, I'm talking assignment here, not binding.
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