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my $in = [ one => 1, two => 2, two => '2.003' ];
my %h;
...
for @$in -> $k, $v {
    %h{$k}.push: $v;
}

use v6;

...

# output:
# {"one" => [1], "two" => [2, "2.003"]}

use v6;

...

# vim: ft=perl6 sw=4 ts=4 expandtab
# same output

%h{.key}.push: .value for @$in:

my %h = $in.classify: { $_ };

for @($in) -> $k, $v {
    %h{$k} //= [];
    %h{$k}.push: $v;
}