I am not entirely clear on the behavior you're trying to get. Are you trying to get e.g REPLACE_PERL to not only rewrite #!/usr/bin/perl but also #!/usr/bin/env perl to #!@PREFIX@/bin/perl with no additional controls? That seems at first glance reasonable, but I dimly recall that there are subtle reasons why it's more complicated than it ought to be. So I'm not opposed, but I'd like to hear from people who have been part of this discussion before.
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