Your form key/value pairs need to be specified as Content:
$browser->post("$BASEURL?use-a", { 'target' => '195' } ); # now a hash
+ref

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The documentation for ->post mentions $field_name which may be confused as being a form key name. The $field_name => $value pairs actually get pushed onto the Header instead of the Content.

In reply to Re: Using Mechanize With Odd Query String by repellent
in thread Using Mechanize With Odd Query String by varanasi

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