就个人而言，我喜欢 List::MoreUtils 的 uniq 处理这个.子程序非常简单，可以按原样使用，也可以通过模块使用.

Personally, I like how List::MoreUtils's uniq handles this. The subroutine is quite simple, and can be used as-is, or through the module.

my %seen;
my @dedupe = grep { not $seen{$_}++ } @{$hash{$var}};

模块中的子程序如下所示:

The subroutine from the module looks like this:

sub uniq (@) {
    my %seen = ();
    grep { not $seen{$_}++ } @_;
}

此代码保留列表的初始顺序.

This code preserves the initial order of the list.