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As you pointed out, it won't catch typos when calling the subroutine. Which is the important case.

Since there's no reason to use the hash key more than once inside the subroutine, the protecting inside the subroutine is just overhead, adding absolutely nothing at all of value:

sub whatever {
    my %params = @_;
    my $key1 = $params{key1};
    my $key2 = $params{key2};
    my $key3 = $params{key3};
    ... neither %params, nor the key names are needed anymore ...
}
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Alternatively, you can stick the key names in variables.

In reply to Re^5: Benifits of using hash rather than number of variables? by JavaFan
in thread Benifits of using hash rather than number of variables? by tart

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