In the years since I've written this, UNIVERSAL::isa has been written. Use that instead.
You might consider something along the lines of this explode() function. It finds the lowest level values and returns that as a list. This probably doesn't get to exactly what you want but its a starter idea for you anyway.
use UNIVERSAL 'isa';
sub explode {
map ref $_ ? explode( isa( $_, 'HASH' ) ? keys %$_ :
isa( $_, 'ARRAY' ) ? @$_ :
isa( $_, 'CODE' ) ? $_->() :
isa( $_, 'SCALAR' ) ? $$_ :
isa( $_, 'REF' ) ? $$_ :
$_ ) :
$_,
@_;
}
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