If the hash is not ragged, you simply know its dimensionality. If you somehow lose this information
sub hashfirst { $_[0]->{($_) = keys %{$_[0]}} }
sub shape {
my $h = shift;
my @s;
for (;'HASH' ne ref $h; $h = hashfirst($h)) {
push @s, scalar(keys %$h);
}
@s
}
may help you remember. This feels like an X-Y question.
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